Daniel Holbert
bb9006d664
This is the behavior that was resolved on in https://github.com/w3c/csswg-drafts/issues/11716 I'm including a WPT that exercises a bunch of different cases where 'auto' is or isn't preserved in getComputedStyle. Differential Revision: https://phabricator.services.mozilla.com/D243234
97 lines
4.1 KiB
HTML
97 lines
4.1 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>CSSOM: resolved value of min-width and min-height:auto should be 0 except in certain defined cases</title>
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<link rel="help" href="https://drafts.csswg.org/cssom/#resolved-value">
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<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#valdef-width-auto">
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<link rel="help" href="https://drafts.csswg.org/css-sizing-4/#aspect-ratio">
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<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11716">
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<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
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<link rel="author" title="Mozilla" href="https://mozilla.org">
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<script src=/resources/testharness.js></script>
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<script src=/resources/testharnessreport.js></script>
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<!-- OVERVIEW:
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* Elements to be tested here must include an 'id'.
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* We use a "preservesAuto" attribute to tag the elements
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are expected to preserve "auto" in the resolved value of
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min-width and min-height.
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-->
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<!-- The test content is in a scrollable div for cosmetic reasons, so that it
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can be inspected but also doesn't push the testharness output off the
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bottom of the screen: -->
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<div style="overflow: scroll; width: 300px; height: 200px">
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<div id="block-box"></div>
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<div id="inline-box"></div>
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<!-- Elements with a nondefault aspect-ratio preserve 'auto': -->
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<div id="block-with-valid-aspect-ratio" style="aspect-ratio: 1/1"
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preservesAuto></div>
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<div id="block-with-degenerate-aspect-ratio" style="aspect-ratio: 0/1"
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preservesAuto></div>
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<div id="block-with-two-part-valid-aspect-ratio"
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style="aspect-ratio: auto 1/1" preservesAuto></div>
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<div id="block-with-two-part-degenerate-aspect-ratio"
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style="aspect-ratio: auto 0/1" preservesAuto></div>
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<!-- Note: aspect-ratio doesn't apply to inline boxes, but we treat it as
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toggling getComputedStyle to return the true 'min-width:auto' value
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regardless. -->
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<span id="inline-with-valid-aspect-ratio" style="aspect-ratio: 1/1"
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preservesAuto></span>
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<span id="inline-with-degenerate-aspect-ratio" style="aspect-ratio: 0/1"
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preservesAuto></span>
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<!-- flex and grid items should preserve 'auto': -->
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<div style="display: flex">
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<div id="flex-item-row" preservesAuto></div>
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</div>
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<div style="display: flex; flex-direction: column;">
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<div id="flex-item-column" preservesAuto></div>
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</div>
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<div style="display: grid">
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<div id="grid-item" preservesAuto></div>
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</div>
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<!-- Per https://drafts.csswg.org/css-sizing/#valdef-width-auto
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the min-width/min-height:auto value "resolves to zero when no box is
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generated" (regardless of aspect-ratio & flex/grid-item special cases)
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-->
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<div id="display-none" style="display: none"></div>
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<div id="display-none-valid-aspect-ratio"
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style="display: none; aspect-ratio:2/1"></div>
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<div style="display:none">
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<div id="display-none-subtree-valid-aspect-ratio"
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style="aspect-ratio:2/1"></div>
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</div>
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<div style="display: none">
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<div style="display: flex">
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<div id="display-none-subtree-flex-item"></div>
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</div>
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</div>
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<div style="display: none">
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<div style="display: grid">
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<div id="display-none-subtree-grid-item"></div>
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</div>
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</div>
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</div>
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<script>
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for (const e of document.querySelectorAll("[id]")) {
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test(function() {
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const cs = getComputedStyle(e);
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const doesPreserveAuto = e.hasAttribute("preservesAuto");
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const expectedVal = doesPreserveAuto ? "auto" : "0px";
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const expectationMessage = doesPreserveAuto ?
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"should round-trip through getComputedStyle" :
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`should be converted to ${expectedVal} in getComputedStyle`;
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for (const prop of ["min-width", "min-height"]) {
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assert_equals(cs[prop], expectedVal, `${e.id}: '${prop}:auto' ${expectationMessage} (as initial value)`);
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e.style.setProperty(prop, "auto");
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assert_equals(cs[prop], expectedVal, `${e.id}: '${prop}:auto' ${expectationMessage} (as specified value)`);
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e.style.removeProperty(prop);
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}
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}, `Resolved value of min-width & min-height 'auto' keyword behaves as expected on element with id="${e.id}"`);
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}
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</script>
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