<!doctype html> <title>CSS Container Queries Test: counters inside container should not affect container size via flex layout</title> <link rel="help" href="https://drafts.csswg.org/css-contain-3/#container-type"> <link rel="stylesheet" href="/fonts/ahem.css"> <script src="/resources/testharness.js"></script> <script src="/resources/testharnessreport.js"></script> <script src="support/cq-testcommon.js"></script> <style> #flex { width: 200px; display: flex; flex-direction: row; counter-reset: my-count 0; } /* #item1 grows to use remaining space given #item2's content */ #item1 { flex-grow: 1; height: 100px; } #container { container-type: size; } #item2 { flex-grow: 0; font: 50px/1 Ahem; } /* #item2 size depends on generated content which depends on my-count counter. */ #item2::before { display: inline-block; content: counter(my-count); } /* The counter-increment inside the container should not affect the size of #item2 because of style containment. Otherwise we would have a circularity. */ @container (min-width: 125px) { #inner { counter-increment: my-count 10; background-color: green; } } </style> <div id="flex"> <div id="item1"> <div id="container"> <div id="inner"></div> </div> </div> <div id="item2"></div> </div> <script> setup(() => assert_implements_container_queries()); const item1_width = parseInt(getComputedStyle(item1).width); const item2_width = parseInt(getComputedStyle(item2).width); const container_width = parseInt(getComputedStyle(container).width); const inner_width = parseInt(getComputedStyle(inner).width); test(() => { assert_equals(item1_width, container_width); assert_equals(item1_width, inner_width); }, "#item1, #container, and #inner should all have the same width: " + item1_width); test(() => { let expected_background = container_width >= 125 ? "rgb(0, 128, 0)" : "rgba(0, 0, 0, 0)"; assert_equals(getComputedStyle(inner).backgroundColor, expected_background); }, "The container query should match the layed out width"); test(() => { assert_equals(item1_width + item2_width, 200); }, "The sum of the item widths should match the flexbox width"); test(() => { assert_equals(parseInt(getComputedStyle(item2, "::before").width), item2_width); }, "The size of the flex item #2 should be given by its contents"); </script>