107 lines
3.2 KiB
HTML
107 lines
3.2 KiB
HTML
<!doctype HTML>
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<html>
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<meta charset="utf8">
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<title>Content Visibility: measure layout</title>
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<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
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<meta name="assert" content="content-visibility hidden element layout is correct">
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<meta name="assert" content="content-visibility hidden element's subtree layout is correct">
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<style>
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#container {
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background: lightgreen;
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contain: layout;
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}
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.hidden {
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content-visibility: hidden;
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}
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#sizer {
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width: 100px;
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height: 100px;
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}
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.child {
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width: 20px;
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height: 20%;
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background: cyan;
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}
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#spacer {
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width: 150px;
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height: 150px;
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background: green;
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}
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</style>
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<div id="parent"></div>
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<div id="spacer"></div>
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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>
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async_test((t) => {
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function createChild(id) {
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const child = document.createElement("div");
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child.classList = "child";
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child.id = id;
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return child;
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}
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function measureForced() {
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t.step(() => {
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// Ensure children are laid out; this forces a layout if it wasn't done.
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assert_equals(document.getElementById("0").offsetTop, 0, "0 forced");
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assert_equals(document.getElementById("1").offsetTop, 20, "1 forced");
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assert_equals(document.getElementById("2").offsetTop, 40, "2 forced");
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// Both parent should be 0 height, since it's hidden. Both parent and spacers
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// should have 8 offsetTop.
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assert_equals(document.getElementById("parent").offsetTop, 8, "parent forced");
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assert_equals(document.getElementById("spacer").offsetTop, 8, "spacer forced");
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});
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}
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function measureWhenVisible() {
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t.step(() => {
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// Ensure children are still laid out.
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assert_equals(document.getElementById("0").offsetTop, 0, "0 when visible");
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assert_equals(document.getElementById("1").offsetTop, 20, "1 when visible");
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assert_equals(document.getElementById("2").offsetTop, 40, "2 when visible");
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// Now the parent should encompass a container, so spacer is pushed down.
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assert_equals(document.getElementById("parent").offsetTop, 8, "parent when visible");
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assert_equals(document.getElementById("spacer").offsetTop, 108, "spacer when visible");
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});
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}
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function construct(container) {
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const sizer = document.createElement("div");
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sizer.id = "sizer";
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container.appendChild(sizer);
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sizer.appendChild(createChild("0"));
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sizer.appendChild(createChild("1"));
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sizer.appendChild(createChild("2"));
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}
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async function runTest() {
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const container = document.createElement("div");
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container.id = "container";
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document.getElementById("parent").appendChild(container);
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container.classList.add("hidden");
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requestAnimationFrame(() => {
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construct(container);
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measureForced();
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container.classList.remove("hidden");
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requestAnimationFrame(() => requestAnimationFrame(() => {
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measureWhenVisible();
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t.done();
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}));
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});
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}
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window.onload = function() {
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requestAnimationFrame(() => requestAnimationFrame(runTest));
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};
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}, "Measure Forced Layout");
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</script>
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</html>
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