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