tor-browser

The Tor Browser
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anchor-scroll-position-try-004.html (2102B)

      1 <!DOCTYPE html>
      2 <title>Tests position fallback with scrollers with mixed writing modes</title>
      3 <link rel="author" href="mailto:xiaochengh@chromium.org">
      4 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#scroll">
      5 <link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback-apply">
      6 <script src="/resources/testharness.js"></script>
      7 <script src="/resources/testharnessreport.js"></script>
      8 <script src="support/test-common.js"></script>
      9 
     10 <style>
     11 body {
     12  margin: 0;
     13 }
     14 
     15 #vrl-scroller {
     16  writing-mode: vertical-rl;
     17  overflow-x: scroll;
     18  width: calc(100vw - 90px);
     19  height: 400px;
     20  outline: 1px solid black;
     21 }
     22 
     23 #anchor {
     24  anchor-name: --a;
     25  width: 100px;
     26  height: 100px;
     27  margin-left: 120lvw;
     28  background: orange;
     29 }
     30 
     31 #anchored {
     32  position: fixed;
     33  width: 100px;
     34  height: 100px;
     35  background: green;
     36  position-anchor: --a;
     37  position-try-fallbacks: --pf1, --pf2;
     38  /* Top of the anchor */
     39  bottom: anchor(top);
     40  left: anchor(left);
     41 }
     42 
     43 @position-try --pf1 {
     44  /* Bottom of the anchor */
     45  top: anchor(bottom);
     46  bottom: auto;
     47 }
     48 @position-try --pf2 {
     49  /* Left of the anchor */
     50  top: anchor(top);
     51  right: anchor(left);
     52  bottom: auto;
     53  left: auto;
     54 }
     55 </style>
     56 
     57 <div style="height: 200px"></div>
     58 <div id="vrl-scroller">
     59  <div id="anchor"></div>
     60 </div>
     61 <div style="height: 120lvh"></div>
     62 <div id="anchored"></div>
     63 
     64 <script>
     65 promise_test(async () => {
     66  await waitUntilNextAnimationFrame();
     67  assert_fallback_position(anchored, anchor, 'top');
     68 }, 'Should use the first fallback position at the initial scroll offsets');
     69 
     70 promise_test(async () => {
     71  document.documentElement.scrollTop = 101;
     72  await waitUntilNextAnimationFrame();
     73  assert_fallback_position(anchored, anchor, 'bottom');
     74 }, 'Should use the second fallback position after scrolling viewport down');
     75 
     76 promise_test(async () => {
     77  let vrlScroller = document.getElementById('vrl-scroller');
     78  vrlScroller.scrollLeft = -100;
     79  await waitUntilNextAnimationFrame();
     80  assert_fallback_position(anchored, anchor, 'left');
     81 }, 'Should use the third fallback position after scrolling the vrl scroller left');
     82 </script>