Merge from upstream

.eleventyignore

@@ -1,5 +1,6 @@
 .DS_Store
 .github/
+.netlify/
 _site/
 node_modules/
 package-lock.json

.github/workflows/codeql-analysis.yml

@@ -0,0 +1,71 @@
+# For most projects, this workflow file will not need changing; you simply need
+# to commit it to your repository.
+#
+# You may wish to alter this file to override the set of languages analyzed,
+# or to provide custom queries or build logic.
+#
+# ******** NOTE ********
+# We have attempted to detect the languages in your repository. Please check
+# the `language` matrix defined below to confirm you have the correct set of
+# supported CodeQL languages.
+#
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [ main ]
+  schedule:
+    - cron: '45 2 * * 0'
+
+jobs:
+  analyze:
+    name: Analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'javascript' ]
+        # CodeQL supports [ 'cpp', 'csharp', 'go', 'java', 'javascript', 'python' ]
+        # Learn more:
+        # https://docs.github.com/en/free-pro-team@latest/github/finding-security-vulnerabilities-and-errors-in-your-code/configuring-code-scanning#changing-the-languages-that-are-analyzed
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v2
+
+    # Initializes the CodeQL tools for scanning.
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v1
+      with:
+        languages: ${{ matrix.language }}
+        # If you wish to specify custom queries, you can do so here or in a config file.
+        # By default, queries listed here will override any specified in a config file.
+        # Prefix the list here with "+" to use these queries and those in the config file.
+        # queries: ./path/to/local/query, your-org/your-repo/queries@main
+
+    # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+    # If this step fails, then you should remove it and run the build manually (see below)
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@v1
+
+    # ℹ️ Command-line programs to run using the OS shell.
+    # 📚 https://git.io/JvXDl
+
+    # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+    #    and modify them (or add more) to build your code if your project
+    #    uses a compiled language
+
+    #- run: |
+    #   make bootstrap
+    #   make release
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v1

.gitignore

@@ -4,3 +4,5 @@ node_modules/
 js/min.js
 js/min.js.map
 .vscode/
+.netlify/
+export

README.md

@@ -8,8 +8,8 @@ Based on the awesome [eleventy-base-blog](https://github.com/11ty/eleventy-base-
 
 ## Demo
 
-* [Netlify Demo](https://eleventy-high-performance-blog-sample.industrialempathy.com/)
-* [Original site this template was based on](https://www.industrialempathy.com/)
+- [Netlify Demo](https://eleventy-high-performance-blog-sample.industrialempathy.com/)
+- [Original site this template was based on](https://www.industrialempathy.com/)
 
 ## Getting Started
 
@@ -36,11 +36,13 @@ npm install
 ```
 
 ### 5. Build, serve, watch and test
+
 ```
 npm run watch
 ```
 
 ### 6. Build and test
+
 ```
 npm run build
 ```
@@ -54,7 +56,7 @@ npm run build
 
 ```css
 :root {
-  --primary: #E7BF60;
+  --primary: #e7bf60;
   --primary-dark: #f9c412;
 }
 ```
@@ -75,7 +77,8 @@ npm run build
 
 - Generates multiple sizes of each image and uses them in **`srcset`**.
 - Generates a **blurry placeholder** for each image (without adding an HTML element or using JS).
-- Transcodes images to [AVIF](https://en.wikipedia.org/wiki/AV1#AV1_Image_File_Format_(AVIF)) (currently off-by-default due to instability of the encoder) and [webp](https://developers.google.com/speed/webp) and generates `picture` element.
+- Transcodes images to [AVIF](<https://en.wikipedia.org/wiki/AV1#AV1_Image_File_Format_(AVIF)>) and [webp](https://developers.google.com/speed/webp) and generates `picture` element.
+- Transcodes GIFs to muted looping autoplaying MP4 videos for greatly reduced file size.
 - **Lazy loads** images (using [native `loading=lazy`](https://web.dev/native-lazy-loading/)).
 - **Async decodes** images (using `decoding=async`).
 - **Lazy layout** of images and placeholders using [`content-visibility: auto`](https://web.dev/content-visibility/#skipping-rendering-work-with-content-visibility).
@@ -102,14 +105,15 @@ npm run build
 #### Fonts
 
 - Serves fonts from same origin.
-- Makes fonts `display:swap`.
+- Makes fonts `display:optional`.
 
 #### Analytics
 
 - Supports locally serving Google Analytics's JS and proxying it's hit requests to a Netlify proxy (other proxies could be easily added).
+- Supports sending [Core Web Vitals](https://web.dev/vitals/) metrics to Google Analytics as [events](https://github.com/GoogleChrome/web-vitals#send-the-results-to-google-analytics).
 - Support for noscript hit requests.
 - Avoids blocking onload on analytics requests.
-- To turn this on, specify `googleAnalyticsId` in `metadata.json`. 
+- To turn this on, specify `googleAnalyticsId` in `metadata.json`. (Note, that this is not compatible with the not-yet-commonly used version 4 of Google Analytics.)
 
 ### DX features
 

_11ty/blurry-placeholder.js

@@ -59,6 +59,7 @@ async function getDataURI(src) {
   const info = await sizeOf(src);
   const imgDimension = getBitmapDimensions_(info.width, info.height);
   const buffer = await sharp(src)
+    .rotate() // Manifest rotation from metadata
     .resize(imgDimension.width, imgDimension.height)
     .png()
     .toBuffer();

_11ty/img-dim.js

@@ -25,8 +25,7 @@ const sizeOf = promisify(require("image-size"));
 const blurryPlaceholder = require("./blurry-placeholder");
 const srcset = require("./srcset");
 const path = require("path");
-
-const ACTIVATE_AVIF = false;
+const { gif2mp4 } = require("./video-gif");
 
 /**
  * Sets `width` and `height` on each image, adds blurry placeholder
@@ -45,6 +44,9 @@ const processImage = async (img, outputPath) => {
     src =
       "/" +
       path.relative("./_site/", path.resolve(path.dirname(outputPath), src));
+    if (path.sep == "\\") {
+      src = src.replace(/\\/g, "/");
+    }
   }
   let dimensions;
   try {
@@ -60,57 +62,66 @@ const processImage = async (img, outputPath) => {
   if (dimensions.type == "svg") {
     return;
   }
+  if (dimensions.type == "gif") {
+    const videoSrc = await gif2mp4(src);
+    const video = img.ownerDocument.createElement(
+      /AMP/i.test(img.tagName) ? "amp-video" : "video"
+    );
+    [...img.attributes].map(({ name, value }) => {
+      video.setAttribute(name, value);
+    });
+    video.src = videoSrc;
+    video.setAttribute("autoplay", "");
+    video.setAttribute("muted", "");
+    video.setAttribute("loop", "");
+    if (!video.getAttribute("aria-label")) {
+      video.setAttribute("aria-label", img.getAttribute("alt"));
+      video.removeAttribute("alt");
+    }
+    img.parentElement.replaceChild(video, img);
+    return;
+  }
   if (img.tagName == "IMG") {
     img.setAttribute("decoding", "async");
     img.setAttribute("loading", "lazy");
-    // Contain the intrinsic to the `--main-width` (width of the main article body)
-    // and the aspect ratio times that size. But because images are `max-width: 100%`
-    // use the `min` operator to set the actual dimensions of the image as the
-    // ceiling 🤯.
-    const containSize = `min(var(--main-width), ${
-      dimensions.width
-    }px) min(calc(var(--main-width) * ${
-      dimensions.height / dimensions.width
-    }), ${dimensions.height}px)`;
     img.setAttribute(
       "style",
       `background-size:cover;` +
-        `contain-intrinsic-size: ${containSize};` +
         `background-image:url("${await blurryPlaceholder(src)}")`
     );
     const doc = img.ownerDocument;
     const picture = doc.createElement("picture");
     const avif = doc.createElement("source");
     const webp = doc.createElement("source");
     const jpeg = doc.createElement("source");
-    if (ACTIVATE_AVIF) {
-      await setSrcset(avif, src, "avif");
-    }
+    await setSrcset(avif, src, "avif");
     avif.setAttribute("type", "image/avif");
     await setSrcset(webp, src, "webp");
     webp.setAttribute("type", "image/webp");
-    await setSrcset(jpeg, src, "jpeg");
+    const fallback = await setSrcset(jpeg, src, "jpeg");
     jpeg.setAttribute("type", "image/jpeg");
-    if (ACTIVATE_AVIF) {
-      picture.appendChild(avif);
-    }
+    picture.appendChild(avif);
     picture.appendChild(webp);
     picture.appendChild(jpeg);
     img.parentElement.replaceChild(picture, img);
     picture.appendChild(img);
+    img.setAttribute("src", fallback);
   } else if (!img.getAttribute("srcset")) {
-    await setSrcset(img, src, "jpeg");
+    const fallback = await setSrcset(img, src, "jpeg");
+    img.setAttribute("src", fallback);
   }
 };
 
 async function setSrcset(img, src, format) {
-  img.setAttribute("srcset", await srcset(src, format));
+  const setInfo = await srcset(src, format);
+  img.setAttribute("srcset", setInfo.srcset);
   img.setAttribute(
     "sizes",
     img.getAttribute("align")
       ? "(max-width: 608px) 50vw, 187px"
       : "(max-width: 608px) 100vw, 608px"
   );
+  return setInfo.fallback;
 }
 
 const dimImages = async (rawContent, outputPath) => {

_11ty/optimize-html.js

@@ -31,7 +31,7 @@ const csso = require("csso");
 
 /**
  * Inlines the CSS.
- * Makes font display display-swap
+ * Makes font display display-optional
  * Minifies and optimizes the JS
  * Optimizes HTML
  * Optimizes AMP
@@ -49,7 +49,10 @@ const purifyCss = async (rawContent, outputPath) => {
       encoding: "utf-8",
     });
 
-    before = before.replace(/@font-face {/g, "@font-face {font-display:swap;");
+    before = before.replace(
+      /@font-face {/g,
+      "@font-face {font-display:optional;"
+    );
 
     const purged = await new PurgeCSS().purge({
       content: [