Re: [w3c/webcomponents] Mechanism for setting the tabindex focus flag without sprouting tabindex attribute? (#762)

> I agree that <select> is an outlier. I checked macOS native behavior, not Safari behavior, and found that NSPopupButton and widgets like listbox are not tabbable by default.

That's correct about popups in macOS system UI. We made an exception for WebKit for complicated reasons, and Safari/WebKit popup buttons allow typing (without even having to hit space to pop up the menu first). However, all the list boxes I could find in macOS system apps are in the tab focus cycle. They also allow typing - if you start typing the prefix of an item in the list it will select it.


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