69 lines
2.4 KiB
HTML
69 lines
2.4 KiB
HTML
<!DOCTYPE html>
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<title>position-area with fallback and scrolling, tall anchor</title>
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<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll">
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="support/test-common.js"></script>
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<style>
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#anchored {
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position: absolute;
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box-sizing: border-box;
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border: solid;
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position-anchor: --anchor;
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position-try-fallbacks: flip-block;
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width: 50%;
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height: 50%;
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background: cyan;
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}
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</style>
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<div id="scrollable" style="position:relative; overflow:scroll; scrollbar-width:none; width:500px; height:500px; background:yellow;">
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<div style="display: flow-root; width:2000px; height:2000px;">
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<div style="anchor-name:--anchor; margin:200px; width:50px; height:1000px; background:gray;"></div>
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<div id="anchored" style="position-area:top left;"></div>
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</div>
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</div>
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<script>
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function assert_rects_equal(elm, x, y, width, height) {
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assert_equals(elm.offsetLeft, x, (elm.id + " x"));
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assert_equals(elm.offsetTop, y, (elm.id + " y"));
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assert_equals(elm.offsetWidth, width, (elm.id + " width"));
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assert_equals(elm.offsetHeight, height, (elm.id + " height"));
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}
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promise_test(async() => {
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await waitUntilNextAnimationFrame();
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await waitUntilNextAnimationFrame();
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assert_rects_equal(anchored, 100, 100, 100, 100);
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}, "Initial scroll position");
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promise_test(async() => {
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// Swich to bottom option.
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scrollable.scrollTo(0, 1500);
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await waitUntilNextAnimationFrame();
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await waitUntilNextAnimationFrame();
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assert_rects_equal(anchored, 100, 1200, 100, 400);
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}, "Scroll to the bottom");
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promise_test(async() => {
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scrollable.scrollTo(0, 500);
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await waitUntilNextAnimationFrame();
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await waitUntilNextAnimationFrame();
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assert_rects_equal(anchored, 100, 1200, 100, 400);
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}, "Scroll to 500");
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promise_test(async() => {
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scrollable.scrollTo(0, 195);
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await waitUntilNextAnimationFrame();
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await waitUntilNextAnimationFrame();
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assert_rects_equal(anchored, 100, 1200, 100, 400);
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}, "Scroll to 195");
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promise_test(async() => {
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// Switch to top option.
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scrollable.scrollTo(0, 194);
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await waitUntilNextAnimationFrame();
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await waitUntilNextAnimationFrame();
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assert_rects_equal(anchored, 100, 194, 100, 6);
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}, "Scroll to 194");
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</script>
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