72 lines
1.9 KiB
HTML
72 lines
1.9 KiB
HTML
<!DOCTYPE html>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1543599">
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<link rel="help" href="https://drafts.csswg.org/css-scroll-anchoring/#suppression-triggers">
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<style>
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#hidden {
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display: none;
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background: red;
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}
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#spacer {
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height: calc(100vh + 200px); /* At least 200px of scroll range */
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}
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</style>
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<table>
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<thead>
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<tr>
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<th>1
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<th>1
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<th>1
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<th>1
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</tr>
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</thead>
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<thead id="hidden">
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<tr>
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<th>1
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<th>1
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<th>1
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<th>1
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</tr>
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</thead>
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<tbody>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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<tr><td>0 <td>0 <td>0 <td>0 </tr>
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</tbody>
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</table>
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<div id="spacer"></div>
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<script>
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let firstEvent = true;
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const targetScrollPosition = 100;
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const hidden = document.querySelector("#hidden");
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const t = async_test("Scroll offset doesn't change when an element goes back and forth to display: none");
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window.onscroll = t.step_func(function() {
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hidden.style.display = "block";
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hidden.style.position = "absolute";
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hidden.style.visibility = "hidden";
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window.unused = hidden.offsetHeight;
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hidden.style.display = "";
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hidden.style.position = "";
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hidden.style.visibility = "";
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if (firstEvent) {
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firstEvent = false;
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requestAnimationFrame(t.step_func(function() {
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requestAnimationFrame(t.step_func_done(function() {
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assert_equals(document.scrollingElement.scrollTop, targetScrollPosition);
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}));
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}));
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}
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});
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window.onload = t.step_func(function() {
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window.scrollTo(0, targetScrollPosition);
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});
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</script>
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