Blitz - WPT: flex-one-sets-flex-basis-to-zero-px.html

wpt / css / css-flexbox / flex-one-sets-flex-basis-to-zero-px.html

Data from commit:
708eb61 WPT runner: support mismatch reftests and multiple rel=match links (#665) (2026-08-09)

Subtest	Status	Message
.flexbox 1	PASS
.flexbox 2	PASS
.flexbox 3	PASS
.flexbox 4	PASS
.flexbox 5	PASS
.flexbox 6	FAIL	assert_equals: data-expected-height expected 0 got 7
.flexbox 7	PASS
.flexbox 8	PASS
.flexbox 9	FAIL	assert_equals: data-expected-height expected 0 got 14
.flexbox 10	FAIL	assert_equals: data-expected-width expected 14 got 784
.flexbox 11	FAIL	assert_equals: data-expected-width expected 14 got 784
.flexbox 12	FAIL	assert_equals: data-expected-width expected 0 got 784
.flexbox 13	FAIL	assert_equals: data-expected-width expected 14 got 784
.flexbox 14	FAIL	assert_equals: data-expected-width expected 14 got 784
.flexbox 15	FAIL	assert_equals: data-expected-width expected 0 got 784
.flexbox 16	FAIL	assert_equals: data-expected-width expected 14 got 784
.flexbox 17	FAIL	assert_equals: data-expected-width expected 14 got 784
.flexbox 18	FAIL	assert_equals: data-expected-width expected 0 got 784

Enable JavaScript in test iframe

/css/css-flexbox/flex-one-sets-flex-basis-to-zero-px.html

<!DOCTYPE html>
<html>
<title>CSS Flexbox: flex-basis with zero pixel</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-basis-property">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#intrinsic-main-sizes">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link href="support/flexbox.css" rel="stylesheet">
<meta name="assert" content="This test ensures that setting 'flex-basis' property to
zero pixel or percentage in combination with one value of both 'flex-grow' and 'flex-shrink'
and 'writing-mode' value works properly.">
<style>
.flexbox > div {
    font: 14px/1 Ahem;
    min-width: 0;
    min-height: 0;
}

.flex-zero {
    flex: 0;
}

.flex-zero-one-zero-percent {
    flex: 0 1 0%;
}

.flex-zero-one-zero-px {
    flex: 0 1 0px;
}

.flex-half {
    flex: 0.5;
}

.flex-half-one-zero-percent {
    flex: 0.5 1 0%;
}

.flex-half-one-zero-px {
    flex: 0.5 1 0px;
}

.flex-one-one-zero-percent {
    flex: 1 1 0%;
}

.flex-one-one-zero-px {
    flex: 1 1 0px;
}

.vertical {
    writing-mode: vertical-rl;
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<body onload="document.fonts.ready.then(() => { checkLayout('.flexbox'); })">
<div id=log></div>
<div class="flexbox column">
  <div class="flex-zero" data-expected-height="14">Flex item with flex: 0</div>
</div>

<div class="flexbox column">
  <div class="flex-zero-one-zero-percent" data-expected-height="14">Flex item with flex: 0 1 0%</div>
</div>

<div class="flexbox column">
  <div class="flex-zero-one-zero-px" data-expected-height="0">Flex item with flex: 0 1 0px</div>
</div>

<div class="flexbox column">
  <div class="flex-half" data-expected-height="14">Flex item with flex: 0.5</div>
</div>

<div class="flexbox column">
  <div class="flex-half-one-zero-percent" data-expected-height="14">Flex item with flex: 0.5 1 0%</div>
</div>

<!-- Following comment follows current spec to the letter, but it is not web
     compatible. The expectation is for what everyone is shipping. -->
<!-- A flex-grow of 0 would size the container to the flex base size of the item (0px),
     and a flex-grow of 1 would size it to the max-content contribution of the item (14px).
     Therefore, a flew-grow of 0.5 sizes the container to the average, 7px.
     And then the item grows to fill half of that, 3.5px.
     Note that Gecko, Blink and WebKit use the flex-basis instead. -->
<div class="flexbox column">
  <div class="flex-half-one-zero-px" data-expected-height="0">Flex item with flex: 0.5 1 0px</div>
</div>

<div class="flexbox column">
  <div class="flex-one" data-expected-height="14">Flex item with flex: 1</div>
</div>

<div class="flexbox column">
  <div class="flex-one-one-zero-percent" data-expected-height="14">Flex item with flex: 1 1 0%</div>
</div>

<!-- Following comment follows current spec to the letter, but it is not web
     compatible. The expectation is for what everyone is shipping. -->
<!-- flex-grow is >= 1, so the flex container is sized to the max-content contribution of the item.
     Note that Gecko, Blink and WebKit use the flex-basis instead. -->
<div class="flexbox column">
  <div class="flex-one-one-zero-px" data-expected-height="0">Flex item with flex: 1 1 0px</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-zero" data-expected-width="14">Flex item with flex: 0</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-zero-one-zero-percent" data-expected-width="14">Flex item with flex: 0 1 0%</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-zero-one-zero-px" data-expected-width="0">Flex item with flex: 0 1 0px</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-half" data-expected-width="14">Flex item with flex: 0.5</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-half-one-zero-percent" data-expected-width="14">Flex item with flex: 0.5 1 0%</div>
</div>

<!-- Following comment follows current spec to the letter, but it is not web
     compatible. The expectation is for what everyone is shipping. -->
<!-- A flex-grow of 0 would size the container to the flex base size of the item (0px),
     and a flex-grow of 1 would size it to the max-content contribution of the item (14px).
     Therefore, a flew-grow of 0.5 sizes the container to the average, 7px.
     And then the item grows to fill half of that, 3.5px.
     Note that Gecko, Blink and WebKit use the flex-basis instead. -->
<div class="flexbox column vertical">
  <div class="flex-half-one-zero-px" data-expected-width="0">Flex item with flex: 0.5 1 0px</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-one" data-expected-width="14">Flex item with flex: 1</div>
</div>

<div class="flexbox column vertical">
  <div class="flex-one-one-zero-percent" data-expected-width="14">Flex item with flex: 1 1 0%</div>
</div>

<!-- Following comment follows current spec to the letter, but it is not web
     compatible. The expectation is for what everyone is shipping. -->
<!-- flex-grow is >= 1, so the flex container is sized to the max-content contribution of the item.
     Note that Gecko, Blink and WebKit use the flex-basis instead. -->
<div class="flexbox column vertical">
  <div class="flex-one-one-zero-px" data-expected-width="0">Flex item with flex: 1 1 0px</div>
</div>
</body>
</html>