fix(web-components): add dropdown anchor positioning fallback #34647
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🕵🏾♀️ visual changes to review in the Visual Change Report
vr-tests-web-components/Avatar 1 screenshots
| Image Name | Diff(in Pixels) | Image Type |
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| vr-tests-web-components/Avatar. - Dark Mode.normal.chromium_1.png | 298 | Changed |
vr-tests-web-components/MenuList 3 screenshots
| Image Name | Diff(in Pixels) | Image Type |
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| vr-tests-web-components/MenuList. - Dark Mode.normal.chromium.png | 500 | Changed |
| vr-tests-web-components/MenuList. - RTL.2nd selected.chromium.png | 17 | Changed |
| vr-tests-web-components/MenuList. - RTL.normal.chromium_1.png | 39082 | Changed |
vr-tests-web-components/Switch 1 screenshots
| Image Name | Diff(in Pixels) | Image Type |
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| vr-tests-web-components/Switch. - Dark Mode.normal.chromium_1.png | 92 | Changed |
vr-tests-web-components/TextInput 1 screenshots
| Image Name | Diff(in Pixels) | Image Type |
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| vr-tests-web-components/TextInput. - Dark Mode.normal.chromium_1.png | 286 | Changed |
There were 1 duplicate changes discarded. Check the build logs for more information.
davatron5000
approved these changes
Jun 13, 2025
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Making a note that we'll have to upstream these changes to MAI.
marchbox
reviewed
Jun 13, 2025
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marchbox
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Jun 16, 2025
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Previous Behavior
CSS Anchor positioning isn't supported yet in Firefox or Safari, which causes the listbox popup to detach from its parent dropdown.
New Behavior
The dropdown will fallback to a different positioning strategy using events and animation frames if CSS Anchor Positioning isn't supported.
Related Issue(s)