diff --git a/.github/workflows/playwright.yml.disabled b/.github/workflows/playwright.yml.disabled
new file mode 100644
index 0000000000..3eb13143c3
--- /dev/null
+++ b/.github/workflows/playwright.yml.disabled
@@ -0,0 +1,27 @@
+name: Playwright Tests
+on:
+  push:
+    branches: [ main, master ]
+  pull_request:
+    branches: [ main, master ]
+jobs:
+  test:
+    timeout-minutes: 60
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/setup-node@v4
+      with:
+        node-version: lts/*
+    - name: Install dependencies
+      run: npm ci
+    - name: Install Playwright Browsers
+      run: npx playwright install --with-deps
+    - name: Run Playwright tests
+      run: npx playwright test
+    - uses: actions/upload-artifact@v4
+      if: ${{ !cancelled() }}
+      with:
+        name: playwright-report
+        path: playwright-report/
+        retention-days: 30
diff --git a/.gitignore b/.gitignore
index c76c5355a3..fab667d302 100644
--- a/.gitignore
+++ b/.gitignore
@@ -31,3 +31,10 @@ public/p5.min.js
 # optional local preferences for vscode
 local.code-workspace
 .zed
+
+# Playwright
+/test-results/
+/playwright-report/
+/blob-report/
+/playwright/.cache/
+/playwright/.auth/
diff --git a/package-lock.json b/package-lock.json
index 8f4304b4c5..011de71836 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -32,6 +32,7 @@
       },
       "devDependencies": {
         "@codemirror/lang-javascript": "^6.2.2",
+        "@playwright/test": "^1.58.2",
         "@preact/preset-vite": "^2.8.2",
         "@swc/html": "^1.10.9",
         "@testing-library/preact": "^3.2.3",
@@ -2020,15 +2021,6 @@
         "node": ">=16"
       }
     },
-    "node_modules/@cloudflare/workers-types": {
-      "version": "4.20260316.1",
-      "resolved": "https://registry.npmjs.org/@cloudflare/workers-types/-/workers-types-4.20260316.1.tgz",
-      "integrity": "sha512-HUZ+vQD8/1A4Fz/8WAlzYWcS5W5u3Nu7Dv9adkIkmLfeKqMIRn01vc4nSUBar60KkmohyQHkPi8jtWV/zazvAg==",
-      "dev": true,
-      "license": "MIT OR Apache-2.0",
-      "optional": true,
-      "peer": true
-    },
     "node_modules/@codemirror/autocomplete": {
       "version": "6.20.0",
       "resolved": "https://registry.npmjs.org/@codemirror/autocomplete/-/autocomplete-6.20.0.tgz",
@@ -4226,6 +4218,22 @@
       "integrity": "sha512-Zz+aZWSj8LE6zoxD+xrjh4VfkIG8Ya6LvYkZqtUQGJPZjYl53ypCaUwWqo7eI0x66KBGeRo+mlBEkMSeSZ38Nw==",
       "license": "MIT"
     },
+    "node_modules/@playwright/test": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/@playwright/test/-/test-1.58.2.tgz",
+      "integrity": "sha512-akea+6bHYBBfA9uQqSYmlJXn61cTa+jbO87xVLCWbTqbWadRVmhxlXATaOjOgcBaWU4ePo0wB41KMFv3o35IXA==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright": "1.58.2"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
     "node_modules/@poppinss/colors": {
       "version": "4.1.6",
       "resolved": "https://registry.npmjs.org/@poppinss/colors/-/colors-4.1.6.tgz",
@@ -18879,6 +18887,53 @@
         "pathe": "^2.0.1"
       }
     },
+    "node_modules/playwright": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/playwright/-/playwright-1.58.2.tgz",
+      "integrity": "sha512-vA30H8Nvkq/cPBnNw4Q8TWz1EJyqgpuinBcHET0YVJVFldr8JDNiU9LaWAE1KqSkRYazuaBhTpB5ZzShOezQ6A==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "dependencies": {
+        "playwright-core": "1.58.2"
+      },
+      "bin": {
+        "playwright": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      },
+      "optionalDependencies": {
+        "fsevents": "2.3.2"
+      }
+    },
+    "node_modules/playwright-core": {
+      "version": "1.58.2",
+      "resolved": "https://registry.npmjs.org/playwright-core/-/playwright-core-1.58.2.tgz",
+      "integrity": "sha512-yZkEtftgwS8CsfYo7nm0KE8jsvm6i/PTgVtB8DL726wNf6H2IMsDuxCpJj59KDaxCtSnrWan2AeDqM7JBaultg==",
+      "dev": true,
+      "license": "Apache-2.0",
+      "bin": {
+        "playwright-core": "cli.js"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/playwright/node_modules/fsevents": {
+      "version": "2.3.2",
+      "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
+      "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
+      "hasInstallScript": true,
+      "license": "MIT",
+      "optional": true,
+      "os": [
+        "darwin"
+      ],
+      "engines": {
+        "node": "^8.16.0 || ^10.6.0 || >=11.0.0"
+      }
+    },
     "node_modules/points-on-curve": {
       "version": "0.2.0",
       "resolved": "https://registry.npmjs.org/points-on-curve/-/points-on-curve-0.2.0.tgz",
@@ -23714,6 +23769,7 @@
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       "dev": true,
       "license": "MIT",
+      "peer": true,
       "dependencies": {
         "pathe": "^2.0.3"
       }
@@ -26272,6 +26328,7 @@
       "dev": true,
       "hasInstallScript": true,
       "license": "Apache-2.0",
+      "peer": true,
       "bin": {
         "workerd": "bin/workerd"
       },
@@ -26321,490 +26378,6 @@
         }
       }
     },
-    "node_modules/wrangler/node_modules/@esbuild/aix-ppc64": {
-      "version": "0.27.3",
-      "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.27.3.tgz",
-      "integrity": "sha512-9fJMTNFTWZMh5qwrBItuziu834eOCUcEqymSH7pY+zoMVEZg3gcPuBNxH1EvfVYe9h0x/Ptw8KBzv7qxb7l8dg==",
-      "cpu": [
-        "ppc64"
-      ],
-      "dev": true,
-      "license": "MIT",
-      "optional": true,
-      "os": [
-        "aix"
-      ],
-      "engines": {
-        "node": ">=18"
-      }
-    },
-    "node_modules/wrangler/node_modules/@esbuild/android-arm": {
-      "version": "0.27.3",
-      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.27.3.tgz",
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-        "arm"
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-      "os": [
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-    "node_modules/wrangler/node_modules/@esbuild/android-arm64": {
-      "version": "0.27.3",
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diff --git a/package.json b/package.json
index 05da1278ba..72c544ea33 100644
--- a/package.json
+++ b/package.json
@@ -59,6 +59,7 @@
   },
   "devDependencies": {
     "@codemirror/lang-javascript": "^6.2.2",
+    "@playwright/test": "^1.58.2",
     "@preact/preset-vite": "^2.8.2",
     "@swc/html": "^1.10.9",
     "@testing-library/preact": "^3.2.3",
diff --git a/playwright-tests/find-broken-sketches-on-beta.spec.ts b/playwright-tests/find-broken-sketches-on-beta.spec.ts
new file mode 100644
index 0000000000..27716a34e8
--- /dev/null
+++ b/playwright-tests/find-broken-sketches-on-beta.spec.ts
@@ -0,0 +1,149 @@
+// A playwright test to load various reference page URLs, scroll through for any 
+// sketches, and monitor the console, failing if errors are reported in the console 
+// (with some allowed).
+//
+//How to run: headed: npx playwright test --project=chromium --headed
+//How to run: with UI*: npx playwright test --project=chromium --ui
+//How to run: no UI*: npx playwright test --project=chromium
+//\* these headless modes still have issues with webgl.
+//
+//TODO: rate-limit so we don't hassle the server or more likely get ip-banned by cloudflare CDN
+//TODO: prefetching gets in the way, when links don't have a trailing slash!
+//TODO: consider turning off browser prefetching to lessen request rates.
+//TODO: fix webgl for headless (chromium).  "Error creating webgl context at ..."
+// It's not enough to LOAD the containing page, the browser has to scroll so the sketch is in viewport to get loaded. (and we have to wait a little, especially in the case of shader compilation)
+// TODO: can we cause the browser to load and start all the sketches, without needing them to be in view? 
+// TODO: can we detect and scroll directly to each sketch in turn (waiting 1sec once there), rather than just scrolling through?
+// TODO: test that a bad initial link is correctly reported as such (this could also legitimately be that a ref page has been renamed/removed)
+
+import { test, type Page, type ConsoleMessage, expect } from "@playwright/test";
+import { referencePageURLPaths } from "./reference-links.ts";
+
+type LogSeverity = "exception" | "error" | "other";
+type LogMsg = { url: string, text: string, severity: LogSeverity };
+type LogPolicy = "skipSilently" | "skipButMention" | "log";
+type Config = {
+  shouldLogNonErrorLogsInline: boolean,
+  on404ConsoleMsg: LogPolicy
+}
+
+const config: Config = {
+  shouldLogNonErrorLogsInline: false,
+  on404ConsoleMsg: "skipButMention"
+}
+
+  //TODO: extract this from astro build or data.json
+  function getURLPathsToTest(): string[] {
+    return [      
+      "/reference/p5/intentionallyBadURL/",
+      //on local this will also 404 - no trailing slash
+      "/reference/p5/square",
+      //locally modded up to have some errors
+      "/reference/p5/filterColor/",
+      //the full set
+      ...referencePageURLPaths
+    ]
+  }
+
+
+/**
+ * Attaches listeners to capture console errors, uncaught exceptions. (also non-error console msgs)
+ * @param page 
+ * @param errorLog An array to store captured error messages from the console
+ * @param nonErrorLog An array to store captured non-error messages from the console
+ * @todo do we need to explicitly drop this event handler when we nav away from the page?
+ */
+function setupErrorTracking(page: Page, nonErrorLog: LogMsg[], errorLog: LogMsg[]): void {
+  //1. get the console error and others (but I think this _doesn't_ get exceptions - later)
+  page.on("console", (msg: ConsoleMessage) => {
+    if (msg.type() === "error") {
+      //TODO: generalise to allow filtering of error types we don't care about
+      //is this an error we probably don't care about?
+      if (msg.text().includes("Failed to load resource: the server responded with a status of 404") && config.on404ConsoleMsg !== "log") {
+        if (config.on404ConsoleMsg === "skipButMention") {
+          console.log("Skipping a (maybe) expected 404 - often a prefetch with no trailing slash?")
+        }
+      } else {
+        //log error normally
+        errorLog.push({ severity: "error", text: msg.text(), url: page.url() });
+      }
+    } else {
+      //non error console log
+      nonErrorLog.push({ severity: "other", url: page.url(), text: msg.text() });
+      if (config.shouldLogNonErrorLogsInline) {
+        console.log(`[Console non-error] ${msg.text()} at ${page.url()}`);
+      }
+    }
+  }
+  );
+  //2. also register for exceptions
+  page.on("pageerror", (err: Error) => {
+    errorLog.push({ severity: "exception", text: err.message, url: page.url() });
+  });
+}
+
+test("look for sketch console errors in ref pages", async ({ page }) => {
+  test.setTimeout(60 * 60 * 1000);//60 minutes
+  const pathsToCheck: string[] = getURLPathsToTest();
+
+
+  const allErrors: LogMsg[] = [];
+
+  const errorsInPage: LogMsg[] = [];
+  const nonErrorsInPage: LogMsg[] = [];
+
+  setupErrorTracking(page, nonErrorsInPage, errorsInPage);
+
+  for (const path of pathsToCheck) {
+    const baseURL = "http://localhost:4321"; //"https://beta.p5js.org"
+    const url = `${baseURL}${path}`;
+    console.log("going to url: ", url)
+    await page.goto(url);
+    await page.waitForTimeout(500);
+    await scrollToBottom(page);
+    // Give p5.js setup() and draw() time to execute, and shader compilation!
+    console.log("done scrolling to bottom.  waiting for 1500")
+
+    //TODO: this is a weak point.  no idea how long it could take for everything to load (e.g. compile shader).  can we detect iframe's p5 setup completion? maybe with a small instrumentation change to p5?
+    await page.waitForTimeout(1500);
+
+    if (errorsInPage.length > 0) {
+      console.error(`Errors on ${url}:`, errorsInPage);
+
+      allErrors.push(...errorsInPage);
+      errorsInPage.length = 0; // Clear for next page
+    } else {
+      console.log(`no errors on ${url}`);
+    }
+  }
+
+  //TODO: perhaps provide non-error console outputs for the url(s) which had errors, for more context.
+  //Also take screenshots of them?
+
+  expect(allErrors).toHaveLength(0);
+});
+
+// We need to scroll slowly or otherwise make sure all sketches come into viewport to start loading.  THEN we need to wait a bit!
+// Modified (debugged) from damaon's solution at https://github.com/microsoft/playwright/issues/4302#issuecomment-1882853669
+// There are other solutions we might consider at the same url https://github.com/microsoft/playwright/issues/4302
+async function scrollToBottom(page: Page) {
+  const [scrollY, scrollHeight] = await page.evaluate(() => [
+    window.scrollY,
+    window.document.documentElement.scrollHeight,
+  ])
+  // console.log(`window.scrollY at start: ${scrollY} window scrollHeight: ${scrollHeight}`)
+
+  //TODO: are we going to pay attn to initial scrollY or not?
+  for (let i = 0; scrollY + i < scrollHeight; i += 300) {
+    await page.evaluate((i) => {
+      // console.log("scrolling to: ", i)
+      // TODO: check. this should be scrolling to i + scrollY if we're going to pay attn to the latter
+      window.scrollTo({ top: i, left: 0, behavior: 'smooth' })
+    }, i)
+    await sleep(0.1)
+  }
+}
+
+function sleep(seconds: number) {
+  return new Promise((resolve) => setTimeout(resolve, seconds * 1000))
+}
\ No newline at end of file
diff --git a/playwright-tests/reference-links.ts b/playwright-tests/reference-links.ts
new file mode 100644
index 0000000000..cfb883c537
--- /dev/null
+++ b/playwright-tests/reference-links.ts
@@ -0,0 +1,883 @@
+// This is a temporary file for early testing of playwright to find broken sketches in reference pages
+// eventually these urls would come from the build process (astro's or /docs/reference/data.json)
+// There are some paths here which do not end up having a page generated. Including:
+//  "/reference/p5/types/Array/",
+//  "/reference/p5/types/Boolean/",
+//  "/reference/p5/types/Number/",
+//  "/reference/p5/types/Object/",
+//  "/reference/p5/types/String/",
+export const referencePageURLPaths = [
+  "/reference/p5.Amplitude/getLevel/",
+  "/reference/p5.Amplitude/setInput/",
+  "/reference/p5.Amplitude/smooth/",
+  "/reference/p5.AudioIn/start/",
+  "/reference/p5.AudioIn/stop/",
+  "/reference/p5.Biquad/freq/",
+  "/reference/p5.Biquad/gain/",
+  "/reference/p5.Biquad/res/",
+  "/reference/p5.Biquad/setType/",
+  "/reference/p5.Camera/camera/",
+  "/reference/p5.Camera/centerX/",
+  "/reference/p5.Camera/centerY/",
+  "/reference/p5.Camera/centerZ/",
+  "/reference/p5.Camera/eyeX/",
+  "/reference/p5.Camera/eyeY/",
+  "/reference/p5.Camera/eyeZ/",
+  "/reference/p5.Camera/frustum/",
+  "/reference/p5.Camera/lookAt/",
+  "/reference/p5.Camera/move/",
+  "/reference/p5.Camera/ortho/",
+  "/reference/p5.Camera/pan/",
+  "/reference/p5.Camera/perspective/",
+  "/reference/p5.Camera/set/",
+  "/reference/p5.Camera/setPosition/",
+  "/reference/p5.Camera/slerp/",
+  "/reference/p5.Camera/tilt/",
+  "/reference/p5.Camera/upX/",
+  "/reference/p5.Camera/upY/",
+  "/reference/p5.Camera/upZ/",
+  "/reference/p5.Color/contrast/",
+  "/reference/p5.Color/setAlpha/",
+  "/reference/p5.Color/setBlue/",
+  "/reference/p5.Color/setGreen/",
+  "/reference/p5.Color/setRed/",
+  "/reference/p5.Color/toString/",
+  "/reference/p5.Delay/delayTime/",
+  "/reference/p5.Delay/feedback/",
+  "/reference/p5.Delay/process/",
+  "/reference/p5.Element/addClass/",
+  "/reference/p5.Element/attribute/",
+  "/reference/p5.Element/center/",
+  "/reference/p5.Element/changed/",
+  "/reference/p5.Element/child/",
+  "/reference/p5.Element/class/",
+  "/reference/p5.Element/doubleClicked/",
+  "/reference/p5.Element/dragLeave/",
+  "/reference/p5.Element/dragOver/",
+  "/reference/p5.Element/draggable/",
+  "/reference/p5.Element/drop/",
+  "/reference/p5.Element/elt/",
+  "/reference/p5.Element/hasClass/",
+  "/reference/p5.Element/height/",
+  "/reference/p5.Element/hide/",
+  "/reference/p5.Element/html/",
+  "/reference/p5.Element/id/",
+  "/reference/p5.Element/input/",
+  "/reference/p5.Element/mouseClicked/",
+  "/reference/p5.Element/mouseMoved/",
+  "/reference/p5.Element/mouseOut/",
+  "/reference/p5.Element/mouseOver/",
+  "/reference/p5.Element/mousePressed/",
+  "/reference/p5.Element/mouseReleased/",
+  "/reference/p5.Element/mouseWheel/",
+  "/reference/p5.Element/parent/",
+  "/reference/p5.Element/position/",
+  "/reference/p5.Element/remove/",
+  "/reference/p5.Element/removeAttribute/",
+  "/reference/p5.Element/removeClass/",
+  "/reference/p5.Element/show/",
+  "/reference/p5.Element/size/",
+  "/reference/p5.Element/style/",
+  "/reference/p5.Element/toggleClass/",
+  "/reference/p5.Element/value/",
+  "/reference/p5.Element/width/",
+  "/reference/p5.Envelope/attackTime/",
+  "/reference/p5.Envelope/play/",
+  "/reference/p5.Envelope/releaseTime/",
+  "/reference/p5.Envelope/setADSR/",
+  "/reference/p5.Envelope/setInput/",
+  "/reference/p5.Envelope/triggerAttack/",
+  "/reference/p5.Envelope/triggerRelease/",
+  "/reference/p5.FFT/analyze/",
+  "/reference/p5.FFT/waveform/",
+  "/reference/p5.File/data/",
+  "/reference/p5.File/file/",
+  "/reference/p5.File/name/",
+  "/reference/p5.File/size/",
+  "/reference/p5.File/subtype/",
+  "/reference/p5.File/type/",
+  "/reference/p5.Font/textToContours/",
+  "/reference/p5.Font/textToModel/",
+  "/reference/p5.Font/textToPaths/",
+  "/reference/p5.Font/textToPoints/",
+  "/reference/p5.Framebuffer/autoSized/",
+  "/reference/p5.Framebuffer/begin/",
+  "/reference/p5.Framebuffer/color/",
+  "/reference/p5.Framebuffer/createCamera/",
+  "/reference/p5.Framebuffer/depth/",
+  "/reference/p5.Framebuffer/draw/",
+  "/reference/p5.Framebuffer/end/",
+  "/reference/p5.Framebuffer/get/",
+  "/reference/p5.Framebuffer/height/",
+  "/reference/p5.Framebuffer/loadPixels/",
+  "/reference/p5.Framebuffer/pixelDensity/",
+  "/reference/p5.Framebuffer/pixels/",
+  "/reference/p5.Framebuffer/remove/",
+  "/reference/p5.Framebuffer/resize/",
+  "/reference/p5.Framebuffer/width/",
+  "/reference/p5.Geometry/calculateBoundingBox/",
+  "/reference/p5.Geometry/clearColors/",
+  "/reference/p5.Geometry/computeFaces/",
+  "/reference/p5.Geometry/computeNormals/",
+  "/reference/p5.Geometry/faces/",
+  "/reference/p5.Geometry/flipU/",
+  "/reference/p5.Geometry/flipV/",
+  "/reference/p5.Geometry/gid/",
+  "/reference/p5.Geometry/makeEdgesFromFaces/",
+  "/reference/p5.Geometry/normalize/",
+  "/reference/p5.Geometry/uvs/",
+  "/reference/p5.Geometry/vertexNormals/",
+  "/reference/p5.Geometry/vertexProperty/",
+  "/reference/p5.Geometry/vertices/",
+  "/reference/p5.Graphics/createFramebuffer/",
+  "/reference/p5.Graphics/remove/",
+  "/reference/p5.Graphics/reset/",
+  "/reference/p5.Image/blend/",
+  "/reference/p5.Image/copy/",
+  "/reference/p5.Image/delay/",
+  "/reference/p5.Image/filter/",
+  "/reference/p5.Image/get/",
+  "/reference/p5.Image/getCurrentFrame/",
+  "/reference/p5.Image/height/",
+  "/reference/p5.Image/loadPixels/",
+  "/reference/p5.Image/mask/",
+  "/reference/p5.Image/numFrames/",
+  "/reference/p5.Image/pause/",
+  "/reference/p5.Image/pixelDensity/",
+  "/reference/p5.Image/pixels/",
+  "/reference/p5.Image/play/",
+  "/reference/p5.Image/reset/",
+  "/reference/p5.Image/resize/",
+  "/reference/p5.Image/save/",
+  "/reference/p5.Image/set/",
+  "/reference/p5.Image/setFrame/",
+  "/reference/p5.Image/updatePixels/",
+  "/reference/p5.Image/width/",
+  "/reference/p5.MediaElement/addCue/",
+  "/reference/p5.MediaElement/autoplay/",
+  "/reference/p5.MediaElement/clearCues/",
+  "/reference/p5.MediaElement/connect/",
+  "/reference/p5.MediaElement/disconnect/",
+  "/reference/p5.MediaElement/duration/",
+  "/reference/p5.MediaElement/hideControls/",
+  "/reference/p5.MediaElement/loop/",
+  "/reference/p5.MediaElement/noLoop/",
+  "/reference/p5.MediaElement/onended/",
+  "/reference/p5.MediaElement/pause/",
+  "/reference/p5.MediaElement/play/",
+  "/reference/p5.MediaElement/removeCue/",
+  "/reference/p5.MediaElement/showControls/",
+  "/reference/p5.MediaElement/speed/",
+  "/reference/p5.MediaElement/src/",
+  "/reference/p5.MediaElement/stop/",
+  "/reference/p5.MediaElement/time/",
+  "/reference/p5.MediaElement/volume/",
+  "/reference/p5.Noise/type/",
+  "/reference/p5.Oscillator/freq/",
+  "/reference/p5.Oscillator/phase/",
+  "/reference/p5.Oscillator/setType/",
+  "/reference/p5.Panner/pan/",
+  "/reference/p5.Panner3D/maxDist/",
+  "/reference/p5.Panner3D/positionX/",
+  "/reference/p5.Panner3D/positionY/",
+  "/reference/p5.Panner3D/positionZ/",
+  "/reference/p5.Panner3D/process/",
+  "/reference/p5.Panner3D/rolloff/",
+  "/reference/p5.Panner3D/set/",
+  "/reference/p5.Panner3D/setFalloff/",
+  "/reference/p5.PitchShifter/shift/",
+  "/reference/p5.Reverb/set/",
+  "/reference/p5.Shader/copyToContext/",
+  "/reference/p5.Shader/inspectHooks/",
+  "/reference/p5.Shader/modify/",
+  "/reference/p5.Shader/setUniform/",
+  "/reference/p5.Shader/version/",
+  "/reference/p5.SoundFile/channels/",
+  "/reference/p5.SoundFile/duration/",
+  "/reference/p5.SoundFile/frames/",
+  "/reference/p5.SoundFile/isLooping/",
+  "/reference/p5.SoundFile/isPlaying/",
+  "/reference/p5.SoundFile/jump/",
+  "/reference/p5.SoundFile/loop/",
+  "/reference/p5.SoundFile/onended/",
+  "/reference/p5.SoundFile/pause/",
+  "/reference/p5.SoundFile/play/",
+  "/reference/p5.SoundFile/rate/",
+  "/reference/p5.SoundFile/sampleRate/",
+  "/reference/p5.SoundFile/setLoop/",
+  "/reference/p5.SoundFile/setPath/",
+  "/reference/p5.SoundFile/start/",
+  "/reference/p5.SoundFile/stop/",
+  "/reference/p5.Table/addColumn/",
+  "/reference/p5.Table/addRow/",
+  "/reference/p5.Table/clearRows/",
+  "/reference/p5.Table/columns/",
+  "/reference/p5.Table/findRow/",
+  "/reference/p5.Table/findRows/",
+  "/reference/p5.Table/get/",
+  "/reference/p5.Table/getArray/",
+  "/reference/p5.Table/getColumn/",
+  "/reference/p5.Table/getColumnCount/",
+  "/reference/p5.Table/getNum/",
+  "/reference/p5.Table/getObject/",
+  "/reference/p5.Table/getRow/",
+  "/reference/p5.Table/getRowCount/",
+  "/reference/p5.Table/getRows/",
+  "/reference/p5.Table/getString/",
+  "/reference/p5.Table/matchRow/",
+  "/reference/p5.Table/matchRows/",
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+  "/reference/p5.Table/trim/",
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+  "/reference/p5.TableRow/set/",
+  "/reference/p5.TableRow/setNum/",
+  "/reference/p5.TableRow/setString/",
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+  "/reference/p5.Vector/angleBetween/",
+  "/reference/p5.Vector/array/",
+  "/reference/p5.Vector/clampToZero/",
+  "/reference/p5.Vector/copy/",
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+  "/reference/p5.Vector/dist/",
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+  "/reference/p5.Vector/equals/",
+  "/reference/p5.Vector/fromAngle/",
+  "/reference/p5.Vector/fromAngles/",
+  "/reference/p5.Vector/getValue/",
+  "/reference/p5.Vector/heading/",
+  "/reference/p5.Vector/lerp/",
+  "/reference/p5.Vector/limit/",
+  "/reference/p5.Vector/mag/",
+  "/reference/p5.Vector/magSq/",
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+  "/reference/p5.Vector/random2D/",
+  "/reference/p5.Vector/random3D/",
+  "/reference/p5.Vector/reflect/",
+  "/reference/p5.Vector/rem/",
+  "/reference/p5.Vector/rotate/",
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+  "/reference/p5.Vector/setHeading/",
+  "/reference/p5.Vector/setMag/",
+  "/reference/p5.Vector/setValue/",
+  "/reference/p5.Vector/slerp/",
+  "/reference/p5.Vector/sub/",
+  "/reference/p5.Vector/toString/",
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+  "/reference/p5.Vector/y/",
+  "/reference/p5.Vector/z/",
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+  "/reference/p5.XML/getAttributeCount/",
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+  "/reference/p5.XML/setName/",
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+  "/reference/p5.p5soundSource/stop/",
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+  "/reference/p5.sound/p5.Oscillator/",
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+  "/reference/p5.sound/p5.Reverb/",
+  "/reference/p5.sound/p5.SawOsc/",
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+  "/reference/p5.sound/p5.SoundFile/",
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+  "/reference/p5/constants/HALF_FLOAT/",
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+  "/reference/p5/constants/LABEL/",
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+  "/reference/p5/constants/LINES/",
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+  "/reference/p5/constants/LINE_STRIP/",
+  "/reference/p5/constants/MIRROR/",
+  "/reference/p5/constants/MITER/",
+  "/reference/p5/constants/MOVE/",
+  "/reference/p5/constants/MULTIPLY/",
+  "/reference/p5/constants/NEAREST/",
+  "/reference/p5/constants/NORMAL/",
+  "/reference/p5/constants/OKLAB/",
+  "/reference/p5/constants/OKLCH/",
+  "/reference/p5/constants/OPAQUE/",
+  "/reference/p5/constants/OPEN/",
+  "/reference/p5/constants/OPTION/",
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+  "/reference/p5/constants/P2D/",
+  "/reference/p5/constants/P2DHDR/",
+  "/reference/p5/constants/PATH/",
+  "/reference/p5/constants/PI/",
+  "/reference/p5/constants/PIE/",
+  "/reference/p5/constants/POINTS/",
+  "/reference/p5/constants/PORTRAIT/",
+  "/reference/p5/constants/POSTERIZE/",
+  "/reference/p5/constants/PROJECT/",
+  "/reference/p5/constants/QUADRATIC/",
+  "/reference/p5/constants/QUADS/",
+  "/reference/p5/constants/QUAD_STRIP/",
+  "/reference/p5/constants/QUARTER_PI/",
+  "/reference/p5/constants/RADIANS/",
+  "/reference/p5/constants/RADIUS/",
+  "/reference/p5/constants/RAD_TO_DEG/",
+  "/reference/p5/constants/REMOVE/",
+  "/reference/p5/constants/REPEAT/",
+  "/reference/p5/constants/REPLACE/",
+  "/reference/p5/constants/RETURN/",
+  "/reference/p5/constants/RGB/",
+  "/reference/p5/constants/RGBA/",
+  "/reference/p5/constants/RGBHDR/",
+  "/reference/p5/constants/RIGHT/",
+  "/reference/p5/constants/RIGHT_ARROW/",
+  "/reference/p5/constants/ROUND/",
+  "/reference/p5/constants/SCREEN/",
+  "/reference/p5/constants/SHIFT/",
+  "/reference/p5/constants/SIMPLE/",
+  "/reference/p5/constants/SMOOTH/",
+  "/reference/p5/constants/SOFT_LIGHT/",
+  "/reference/p5/constants/SQUARE/",
+  "/reference/p5/constants/STROKE/",
+  "/reference/p5/constants/SUBTRACT/",
+  "/reference/p5/constants/TAB/",
+  "/reference/p5/constants/TAU/",
+  "/reference/p5/constants/TESS/",
+  "/reference/p5/constants/TEXT/",
+  "/reference/p5/constants/TEXTURE/",
+  "/reference/p5/constants/THRESHOLD/",
+  "/reference/p5/constants/TOP/",
+  "/reference/p5/constants/TRIANGLES/",
+  "/reference/p5/constants/TRIANGLE_FAN/",
+  "/reference/p5/constants/TRIANGLE_STRIP/",
+  "/reference/p5/constants/TWO_PI/",
+  "/reference/p5/constants/UNSIGNED_BYTE/",
+  "/reference/p5/constants/UNSIGNED_INT/",
+  "/reference/p5/constants/UP_ARROW/",
+  "/reference/p5/constants/VERSION/",
+  "/reference/p5/constants/VIDEO/",
+  "/reference/p5/constants/WAIT/",
+  "/reference/p5/constants/WEBGL/",
+  "/reference/p5/constants/WEBGL2/",
+  "/reference/p5/constants/WEBGPU/",
+  "/reference/p5/constants/WORD/",
+  "/reference/p5/constrain/",
+  "/reference/p5/copy/",
+  "/reference/p5/cos/",
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+  "/reference/p5/createAudio/",
+  "/reference/p5/createButton/",
+  "/reference/p5/createCamera/",
+  "/reference/p5/createCanvas/",
+  "/reference/p5/createCapture/",
+  "/reference/p5/createCheckbox/",
+  "/reference/p5/createColorPicker/",
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+  "/reference/p5/createFileInput/",
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+  "/reference/p5/createFramebuffer/",
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+  "/reference/p5/createImage/",
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+  "/reference/p5/createModel/",
+  "/reference/p5/createP/",
+  "/reference/p5/createRadio/",
+  "/reference/p5/createSelect/",
+  "/reference/p5/createShader/",
+  "/reference/p5/createSlider/",
+  "/reference/p5/createSpan/",
+  "/reference/p5/createVector/",
+  "/reference/p5/createVideo/",
+  "/reference/p5/createWriter/",
+  "/reference/p5/cursor/",
+  "/reference/p5/curveDetail/",
+  "/reference/p5/cylinder/",
+  "/reference/p5/day/",
+  "/reference/p5/debugMode/",
+  "/reference/p5/degrees/",
+  "/reference/p5/deltaTime/",
+  "/reference/p5/describe/",
+  "/reference/p5/describeElement/",
+  "/reference/p5/deviceMoved/",
+  "/reference/p5/deviceOrientation/",
+  "/reference/p5/deviceShaken/",
+  "/reference/p5/deviceTurned/",
+  "/reference/p5/directionalLight/",
+  "/reference/p5/disableFriendlyErrors/",
+  "/reference/p5/displayDensity/",
+  "/reference/p5/displayHeight/",
+  "/reference/p5/displayWidth/",
+  "/reference/p5/dist/",
+  "/reference/p5/doubleClicked/",
+  "/reference/p5/draw/",
+  "/reference/p5/drawingContext/",
+  "/reference/p5/ellipse/",
+  "/reference/p5/ellipseMode/",
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+  "/reference/p5/fill/",
+  "/reference/p5/filter/",
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+  "/reference/p5/focused/",
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+  "/reference/p5/fromAxisAngle/",
+  "/reference/p5/frustum/",
+  "/reference/p5/fullscreen/",
+  "/reference/p5/function/",
+  "/reference/p5/get/",
+  "/reference/p5/getAudioContext/",
+  "/reference/p5/getCameraInputs/",
+  "/reference/p5/getColor/",
+  "/reference/p5/getFinalColor/",
+  "/reference/p5/getItem/",
+  "/reference/p5/getObjectInputs/",
+  "/reference/p5/getPixelInputs/",
+  "/reference/p5/getTargetFrameRate/",
+  "/reference/p5/getTexture/",
+  "/reference/p5/getURL/",
+  "/reference/p5/getURLParams/",
+  "/reference/p5/getURLPath/",
+  "/reference/p5/getWorldInputs/",
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+  "/reference/p5/hour/",
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+  "/reference/p5/hue/",
+  "/reference/p5/if/",
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+  "/reference/p5/imageShader/",
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+  "/reference/p5/isLooping/",
+  "/reference/p5/key/",
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+  "/reference/p5/mag/",
+  "/reference/p5/map/",
+  "/reference/p5/max/",
+  "/reference/p5/metalness/",
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+  "/reference/p5/minute/",
+  "/reference/p5/model/",
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+  "/reference/p5/mouseButton/",
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+  "/reference/p5/mouseDragged/",
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+  "/reference/p5/mouseWheel/",
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+  "/reference/p5/normalMaterial/",
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+  "/reference/p5/ortho/",
+  "/reference/p5/p5.Camera/",
+  "/reference/p5/p5.Color/",
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+  "/reference/p5/p5.Geometry/",
+  "/reference/p5/p5.Graphics/",
+  "/reference/p5/p5.Image/",
+  "/reference/p5/p5.MediaElement/",
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+  "/reference/p5/p5.Shader/",
+  "/reference/p5/p5.Table/",
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+  "/reference/p5/panorama/",
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+  "/reference/p5/pop/",
+  "/reference/p5/pow/",
+  "/reference/p5/print/",
+  "/reference/p5/push/",
+  "/reference/p5/pwinMouseX/",
+  "/reference/p5/pwinMouseY/",
+  "/reference/p5/quad/",
+  "/reference/p5/radians/",
+  "/reference/p5/random/",
+  "/reference/p5/randomGaussian/",
+  "/reference/p5/randomSeed/",
+  "/reference/p5/rect/",
+  "/reference/p5/rectMode/",
+  "/reference/p5/red/",
+  "/reference/p5/redraw/",
+  "/reference/p5/registerAddon/",
+  "/reference/p5/remove/",
+  "/reference/p5/removeElements/",
+  "/reference/p5/removeItem/",
+  "/reference/p5/requestPointerLock/",
+  "/reference/p5/resetMatrix/",
+  "/reference/p5/resetShader/",
+  "/reference/p5/resizeCanvas/",
+  "/reference/p5/roll/",
+  "/reference/p5/rotate/",
+  "/reference/p5/rotateBy/",
+  "/reference/p5/rotateX/",
+  "/reference/p5/rotateY/",
+  "/reference/p5/rotateZ/",
+  "/reference/p5/rotationX/",
+  "/reference/p5/rotationY/",
+  "/reference/p5/rotationZ/",
+  "/reference/p5/round/",
+  "/reference/p5/saturation/",
+  "/reference/p5/save/",
+  "/reference/p5/saveCanvas/",
+  "/reference/p5/saveFrames/",
+  "/reference/p5/saveGif/",
+  "/reference/p5/saveJSON/",
+  "/reference/p5/saveObj/",
+  "/reference/p5/saveStl/",
+  "/reference/p5/saveStrings/",
+  "/reference/p5/saveTable/",
+  "/reference/p5/scale/",
+  "/reference/p5/screenToWorld/",
+  "/reference/p5/second/",
+  "/reference/p5/select/",
+  "/reference/p5/selectAll/",
+  "/reference/p5/set/",
+  "/reference/p5/setAttributes/",
+  "/reference/p5/setAudioContext/",
+  "/reference/p5/setCamera/",
+  "/reference/p5/setContent/",
+  "/reference/p5/setMoveThreshold/",
+  "/reference/p5/setShakeThreshold/",
+  "/reference/p5/setup/",
+  "/reference/p5/shader/",
+  "/reference/p5/shearX/",
+  "/reference/p5/shearY/",
+  "/reference/p5/shininess/",
+  "/reference/p5/shuffle/",
+  "/reference/p5/sin/",
+  "/reference/p5/smooth/",
+  "/reference/p5/smoothstep/",
+  "/reference/p5/specularColor/",
+  "/reference/p5/specularMaterial/",
+  "/reference/p5/sphere/",
+  "/reference/p5/spline/",
+  "/reference/p5/splinePoint/",
+  "/reference/p5/splineProperties/",
+  "/reference/p5/splineProperty/",
+  "/reference/p5/splineTangent/",
+  "/reference/p5/splineVertex/",
+  "/reference/p5/splitTokens/",
+  "/reference/p5/spotLight/",
+  "/reference/p5/sq/",
+  "/reference/p5/sqrt/",
+  "/reference/p5/square/",
+  "/reference/p5/storeItem/",
+  "/reference/p5/str/",
+  "/reference/p5/stroke/",
+  "/reference/p5/strokeCap/",
+  "/reference/p5/strokeJoin/",
+  "/reference/p5/strokeMode/",
+  "/reference/p5/strokeShader/",
+  "/reference/p5/strokeWeight/",
+  "/reference/p5/tan/",
+  "/reference/p5/text/",
+  "/reference/p5/textAlign/",
+  "/reference/p5/textAscent/",
+  "/reference/p5/textBounds/",
+  "/reference/p5/textDescent/",
+  "/reference/p5/textDirection/",
+  "/reference/p5/textFont/",
+  "/reference/p5/textLeading/",
+  "/reference/p5/textOutput/",
+  "/reference/p5/textProperties/",
+  "/reference/p5/textProperty/",
+  "/reference/p5/textSize/",
+  "/reference/p5/textStyle/",
+  "/reference/p5/textWeight/",
+  "/reference/p5/textWidth/",
+  "/reference/p5/textWrap/",
+  "/reference/p5/texture/",
+  "/reference/p5/textureMode/",
+  "/reference/p5/textureWrap/",
+  "/reference/p5/tint/",
+  "/reference/p5/torus/",
+  "/reference/p5/touches/",
+  "/reference/p5/translate/",
+  "/reference/p5/triangle/",
+  "/reference/p5/turnAxis/",
+  "/reference/p5/types/Array/",
+  "/reference/p5/types/Boolean/",
+  "/reference/p5/types/Number/",
+  "/reference/p5/types/Object/",
+  "/reference/p5/types/String/",
+  "/reference/p5/unchar/",
+  "/reference/p5/unhex/",
+  "/reference/p5/updatePixels/",
+  "/reference/p5/userStartAudio/",
+  "/reference/p5/userStopAudio/",
+  "/reference/p5/vertex/",
+  "/reference/p5/vertexProperty/",
+  "/reference/p5/webglVersion/",
+  "/reference/p5/while/",
+  "/reference/p5/width/",
+  "/reference/p5/winMouseX/",
+  "/reference/p5/winMouseY/",
+  "/reference/p5/windowHeight/",
+  "/reference/p5/windowResized/",
+  "/reference/p5/windowWidth/",
+  "/reference/p5/worldInputs/",
+  "/reference/p5/worldToScreen/",
+  "/reference/p5/write/",
+  "/reference/p5/year/",
+];
diff --git a/playwright-tests/screenshot-proposed-colour-changes.spec.ts.disabled b/playwright-tests/screenshot-proposed-colour-changes.spec.ts.disabled
new file mode 100644
index 0000000000..19f5caa266
--- /dev/null
+++ b/playwright-tests/screenshot-proposed-colour-changes.spec.ts.disabled
@@ -0,0 +1,108 @@
+// Note: how to record test
+// 1. in vscode, `View: Show Testing`
+// 2. from the Playwright sidebar choose "Record New" (or "Record at cursor")
+// 3. wait for it to open GUI tool
+// 4. click around
+// 5. stop recording in top toolbar of test tool (not vscode)
+// 6. script will be written into new editor tab or at cursor (depending on choice in step 2)
+
+
+import { test, type Page } from "@playwright/test";
+
+test("screenshot alt colours", async ({ page }) => {
+
+  await page.goto('https://editor.p5js.org/');
+
+  //accept /dismiss cookie banner
+  await page.getByRole('button', { name: 'Allow Essential' }).click();
+
+  //switch on dark mode once for editor
+  //set dark mode
+  await page.getByRole('button', { name: 'Open Preferences' }).click();
+  await page.getByText('Dark').click();
+  await page.getByRole('button', { name: 'Close Settings overlay' }).click();
+
+  //1. do for settings
+  await page.getByRole('button', { name: 'p5.js' }).click();
+
+  await runAllStyleTrials(page, "in-settings");
+
+  await page.getByRole('button', { name: 'Close Settings overlay' }).click();
+
+  //2. do for about page
+  await page.getByRole('menuitem', { name: 'Help' }).click();
+  await page.getByRole('menuitem', { name: 'About' }).click();
+  await page.getByRole('link', { name: 'Report a Bug' }).scrollIntoViewIfNeeded();
+  //alternative: 
+  // await page.evaluate(() => {
+  //   window.scrollTo(0, 500); //some arbitrary y position
+  // })
+
+  await runAllStyleTrials(page, "in-about");
+
+  //3. do for file dialog
+  await page.getByRole('link', { name: 'Back to Editor' }).click();
+  await page.getByRole('menuitem', { name: 'File' }).click();
+  await page.getByRole('menuitem', { name: 'Examples' }).click();
+
+  await runAllStyleTrials(page, "in-file-list");
+
+
+});
+
+async function runAllStyleTrials(page: Page, locationLabel: string) {
+  const changesets = [
+    //Note this automation doesn't tidy up (doesn't reload) after each change, 
+    // so for now these changesets MUST all completely replace each other.
+    { name: "2-middle-light", style: { color: "#a6a6a6" } },
+    { name: "2-medium-light", style: { color: "#d9d9d9" } },
+    { name: "2-contrast-pink", style: { color: "#ffa9d9" } },
+    { name: "3-p5-pink-ish", style: { color: "#FF6691" } },
+    // { name: "1-changed-bg-and-link", style: { background: "#000000", color: "#eb285f" } },
+  ]
+
+
+  for (const changeset of changesets) {
+    //not needed
+    await page.waitForTimeout(500);
+    //TODO: how much to scroll?  
+    // perhaps until the first relevant <a href/> is in middle of viewport, ideally?
+    // await scrollToBottom(page);
+
+    await applyThemeOverride(page, "a", changeset.style);
+
+    await page.screenshot({ path: `${locationLabel}-${changeset.name}.png` });
+  }
+}
+
+
+
+
+
+/**
+ * Injects a temporary CSS override into the page.
+ */
+async function applyThemeOverride(page: Page, selector: string, style: { color: string }): Promise<void> {
+
+  await page.addStyleTag({
+
+    content: `
+      ${selector} { 
+      color: ${style.color} !important;      
+      }
+`
+  });
+
+    const cssForBackgroundOverridesUNUSED = `
+.preference {background: #000000}
+
+tr.sketches-table__row {
+  background: #000000 !important; 
+}
+
+.RootPage-sc-1nw49or-0  {
+  background:#000000;
+}
+`;
+
+}
diff --git a/playwright.config.ts b/playwright.config.ts
new file mode 100644
index 0000000000..af52468b2b
--- /dev/null
+++ b/playwright.config.ts
@@ -0,0 +1,79 @@
+import { defineConfig, devices } from '@playwright/test';
+
+/**
+ * Read environment variables from file.
+ * https://github.com/motdotla/dotenv
+ */
+// import dotenv from 'dotenv';
+// import path from 'path';
+// dotenv.config({ path: path.resolve(__dirname, '.env') });
+
+/**
+ * See https://playwright.dev/docs/test-configuration.
+ */
+export default defineConfig({
+  testDir: './playwright-tests',
+  /* Run tests in files in parallel */
+  fullyParallel: true,
+  /* Fail the build on CI if you accidentally left test.only in the source code. */
+  forbidOnly: !!process.env.CI,
+  /* Retry on CI only */
+  retries: process.env.CI ? 2 : 0,
+  /* Opt out of parallel tests on CI. */
+  workers: process.env.CI ? 1 : undefined,
+  /* Reporter to use. See https://playwright.dev/docs/test-reporters */
+  reporter: 'html',
+  /* Shared settings for all the projects below. See https://playwright.dev/docs/api/class-testoptions. */
+  use: {
+    /* Base URL to use in actions like `await page.goto('')`. */
+    // baseURL: 'http://localhost:3000',
+
+    /* Collect trace when retrying the failed test. See https://playwright.dev/docs/trace-viewer */
+    trace: 'on-first-retry',
+  },
+
+  /* Configure projects for major browsers */
+  projects: [
+    {
+      name: 'chromium',
+      use: { ...devices['Desktop Chrome'] },
+    },
+
+    {
+      name: 'firefox',
+      use: { ...devices['Desktop Firefox'] },
+    },
+
+    {
+      name: 'webkit',
+      use: { ...devices['Desktop Safari'] },
+    },
+
+    /* Test against mobile viewports. */
+    // {
+    //   name: 'Mobile Chrome',
+    //   use: { ...devices['Pixel 5'] },
+    // },
+    // {
+    //   name: 'Mobile Safari',
+    //   use: { ...devices['iPhone 12'] },
+    // },
+
+    /* Test against branded browsers. */
+    // {
+    //   name: 'Microsoft Edge',
+    //   use: { ...devices['Desktop Edge'], channel: 'msedge' },
+    // },
+    // {
+    //   name: 'Google Chrome',
+    //   use: { ...devices['Desktop Chrome'], channel: 'chrome' },
+    // },
+  ],
+
+  /* Run your local dev server before starting the tests */
+  // webServer: {
+  //   command: 'npm run start',
+  //   url: 'http://localhost:3000',
+  //   reuseExistingServer: !process.env.CI,
+  // },
+});