<!doctypehtml>
<link rel="help" href="https://drafts.csswg.org/css-viewport/#zoom-om">
<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/9398">
<link rel="author" href="mailto:emilio@crisal.io"title="Emilio Cobos Álvarez">
<link rel="author" href="https://mozilla.org"title="Mozilla">
<title>ResizeObserver sizes account for zoom</title>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style> div {
width: 100px;
height: 100px;
border: 5px solid;
padding: 5px;
margin: 5px;
box-sizing: border-box;
}
</style>
<div></div>
<divstyle="zoom: 2"></div>
<divstyle="zoom: 4"></div>
<script>
promise_test(async function() {
let { promise, resolve } = Promise.withResolvers();
let observer = new ResizeObserver(entries => {
resolve(entries);
});
for (let div of document.querySelectorAll("div")) {
observer.observe(div);
}
let entries = await promise;
observer.disconnect();
assert_equals(entries.length, 3, "Should have three entries");
for (let entry of entries) {
assert_equals(entry.contentRect.top, 5, "content-rect top should be scaled by zoom");
assert_equals(entry.contentRect.left, 5, "content-rect left should be scaled by zoom");
assert_equals(entry.contentRect.width, 80, "content-rect width should be scaled by zoom");
assert_equals(entry.contentRect.height, 80, "content-rect height should be scaled by zoom");
for (let sizeArray of [entry.borderBoxSize, entry.contentBoxSize, entry.devicePixelContentBoxSize]) {
assert_equals(sizeArray.length, 1, "Should have one box");
}
let borderBoxSize = entry.borderBoxSize[0];
let contentBoxSize = entry.contentBoxSize[0];
let devicePixelContentBoxSize = entry.devicePixelContentBoxSize[0];
assert_equals(borderBoxSize.inlineSize, 100, "border inline size should be scaled by zoom");
assert_equals(borderBoxSize.blockSize, 100, "border block size should be scaled by zoom");
assert_equals(contentBoxSize.inlineSize, 80, "content inline size should be scaled by zoom");
assert_equals(contentBoxSize.blockSize, 80, "content block size should be scaled by zoom");
assert_equals(devicePixelContentBoxSize.inlineSize, 80 * entry.target.currentCSSZoom * window.devicePixelRatio, "dev-px size should _not_ be scaled by zoom");
assert_equals(devicePixelContentBoxSize.blockSize, 80 * entry.target.currentCSSZoom * window.devicePixelRatio, "dev-px size should _not_ be scaled by zoom");
}
});
</script>
Messung V0.5 in Prozent
¤ Dauer der Verarbeitung: 0.16 Sekunden
(vorverarbeitet am 2026-08-25)
¤
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