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select-appearance-native-computed-style.html
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<!doctype html>
<link rel="author" title="Aditya Keerthi" href="https://github.com/pxlcoder">
<link rel="help" href="https://html.spec.whatwg.org/#the-select-element">
<link rel="help" href="https://drafts.csswg.org/css-writing-modes/#block-flow">
<title>Select appearance native writing mode computed style</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<select style="writing-mode: horizontal-tb">
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
<option>Option 4</option>
<option>Option 5</option>
</select>
<select style="writing-mode: vertical-lr">
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
<option>Option 4</option>
<option>Option 5</option>
</select>
<select style="writing-mode: vertical-rl">
<option>Option 1</option>
<option>Option 2</option>
<option>Option 3</option>
<option>Option 4</option>
<option>Option 5</option>
</select>
<script>
test(() => {
const select = document.querySelector(`select[style="writing-mode: horizontal-tb"]`);
const style = getComputedStyle(select);
const blockSize = parseInt(style.blockSize, 10);
const inlineSize = parseInt(style.inlineSize, 10);
assert_not_equals(blockSize, 0);
assert_not_equals(inlineSize, 0);
assert_greater_than(inlineSize, blockSize);
assert_equals(style.blockSize, style.height);
assert_equals(style.inlineSize, style.width);
}, `select[style="writing-mode: horizontal-tb"] block size should match height and inline size should match width`);
for (const writingMode of ["vertical-lr", "vertical-rl"]) {
test(() => {
const select = document.querySelector(`select[style="writing-mode: ${writingMode}"]`);
const style = getComputedStyle(select);
const blockSize = parseInt(style.blockSize, 10);
const inlineSize = parseInt(style.inlineSize, 10);
assert_not_equals(blockSize, 0);
assert_not_equals(inlineSize, 0);
assert_greater_than(inlineSize, blockSize);
assert_equals(style.blockSize, style.width);
assert_equals(style.inlineSize, style.height);
}, `select[style="writing-mode: ${writingMode}"] block size should match width and inline size should match height`);
};
</script>