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Support single-value <select> elements (#35684)

Browse source 
https://github.com/user-attachments/assets/9aba75ff-4190-4a85-89ed-d3f3aa53d3b0



Among other things this adds a new `EmbedderMsg::ShowSelectElementMenu`
to tell the embedder to display a select popup at the given location.

This is a draft because some small style adjustments need to be made:
* the select element should always have the width of the largest option
* the border should be part of the shadow tree

Apart from that, it's mostly ready for review.

<details><summary>HTML for demo video</summary>

```html
<html>

<body>
<select id="c" name="choice">
  <option value="first">First Value</option>
  <option value="second">Second Value</option>
  <option value="third">Third Value</option>
</select>
</body>
</html>
```
</details>

---

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- [X] Part of https://github.com/servo/servo/issues/3551
- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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---------

Signed-off-by: Simon Wülker <simon.wuelker@arcor.de>
This commit is contained in:
Simon Wülker 2025-04-03 14:11:55 +02:00 • committed by GitHub
parent 6e9d01b908
commit 0e99539dab
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32 changed files with 633 additions and 151 deletions
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2
tests/wpt/meta/html/rendering/replaced-elements/the-option-element/option-label-whitespace.html.ini vendored
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@ -1,2 +0,0 @@
[option-label-whitespace.html]
expected: FAIL

2
tests/wpt/meta/html/rendering/replaced-elements/the-option-element/option-with-br.html.ini vendored
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@ -1,2 +0,0 @@
[option-with-br.html]
expected: FAIL

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tests/wpt/meta/html/rendering/replaced-elements/the-select-element/select-1-block-size-001.html.ini vendored Normal file
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@ -0,0 +1,2 @@
[select-1-block-size-001.html]
expected: FAIL

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tests/wpt/meta/html/rendering/replaced-elements/the-select-element/select-button-min-height-001.html.ini vendored Normal file
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@ -0,0 +1,2 @@
[select-button-min-height-001.html]
expected: FAIL

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tests/wpt/meta/html/rendering/replaced-elements/the-select-element/select-empty.html.ini vendored Normal file
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@ -0,0 +1,2 @@
[select-empty.html]
expected: FAIL

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tests/wpt/meta/html/rendering/replaced-elements/the-select-element/select-multiple-re-add-option-via-document-fragment.html.ini vendored Normal file
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@ -0,0 +1,2 @@
[select-multiple-re-add-option-via-document-fragment.html]
expected: FAIL

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tests/wpt/meta/html/rendering/widgets/select-wrap-no-spill.optional.html.ini vendored
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@ -1,4 +0,0 @@
[select-wrap-no-spill.optional.html]
[Selected OPTION label with white-space:pre-wrap should not spill out.]
expected: FAIL

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tests/wpt/meta/html/rendering/widgets/the-select-element/option-add-label-quirks.html.ini vendored
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[option-add-label-quirks.html]
expected: FAIL

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tests/wpt/meta/html/rendering/widgets/the-select-element/option-checked-styling.html.ini vendored
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@ -1,2 +0,0 @@
[option-checked-styling.html]
expected: FAIL