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How should the new <selectedoption> element work?
It's part of the new customisable `<select>`, but there are some tricky details.
This means that changes on one element in the selected<option> won't cause everything in the<selectedoption> to 'reset', such as CSS animations. If the content of<selectedoption> has been manually altered, it's possible this change will fail because referenceNode is no longer in element, in which case the node won't be inserted. This is being actively discussed in the HTML spec, but I want a wider set of developers to have their opinions heard on this.
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