See https://github.com/whatwg/html/issues/3410#issuecomment-1212874627 I suppose there's a good reason for this in terms of usability -- it may be hard to select options on a touchscreen without sufficient spacing, and taking up more space for an inline widget might be less web-compatible compared to showing a one-line widget. On even smaller screens like a watch this approach also makes sense. HTML doesn't currently allow it in the rendering section, however. What should the spec say? Allow either inline listbox or a one-line widget that opens a popup? cc @whatwg/forms @mfreed7