diff --git a/README.md b/README.md
index 7390b5c..53a4a93 100644
--- a/README.md
+++ b/README.md
@@ -26,7 +26,7 @@ that layout is visible, while object structure is what keeps a presentation real
 
 [Acid1](https://www.w3.org/Style/CSS/Test/CSS1/current/sec53.htm),
 [Acid2](https://www.webstandards.org/action/acid2/), and
-[Acid3](https://acid3.acidtests.org/) gave every browser the same hostile public
+[Acid3](https://wpt.live/acid/acid3/test.html) gave every browser the same hostile public
 artifact. You did not need a white paper to see what the browser understood and
 what it did not.
 
diff --git a/site/index.html b/site/index.html
index ac15596..22cf391 100644
--- a/site/index.html
+++ b/site/index.html
@@ -61,7 +61,7 @@ <h1 id="hero-title">Make the deck.<br><em>Not a screenshot.</em></h1>
             <a class="button primary" href="https://github.com/aronchick/gloss/raw/refs/heads/main/gloss-v1/benchmark/deck/gold/gloss-v1-gold.pptx">Download the deck <span aria-hidden="true">↓</span></a>
             <a class="button secondary" href="https://github.com/aronchick/gloss">Build it with us <span aria-hidden="true">↗</span></a>
           </div>
-          <p class="acid-line">Remember <a href="https://www.w3.org/Style/CSS/Test/CSS1/current/sec53.htm">Acid1</a>, <a href="https://www.webstandards.org/action/acid2/">Acid2</a>, and <a href="https://acid3.acidtests.org/">Acid3</a>? <strong>Gloss is ACID for presentation decks made by AI.</strong></p>
+          <p class="acid-line">Remember <a href="https://www.w3.org/Style/CSS/Test/CSS1/current/sec53.htm">Acid1</a>, <a href="https://www.webstandards.org/action/acid2/">Acid2</a>, and <a href="https://wpt.live/acid/acid3/test.html">Acid3</a>? <strong>Gloss is ACID for presentation decks made by AI.</strong></p>
         </div>
 
         <div class="editor" data-inspector="title">