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The dropdown menu is here: https://www.w3schools.com/tags/tryit.asp?filename=tryhtml_select
I’d like to change the CSS of the dropdown elements in a <select> element in dev tools, but I can’t make the dropdown stay open.
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this post was submitted on 28 Jul 2023
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Because Firefox cannot interact with the system directly, can only ask the system for the basic drop-down menu. You MIGHT be able to edit it via CSS in the browser UI, but I doubt.
The only browser to have access the style you are showing is Safari due to Apple's choice to lockdown features to their programs only. The system knows how to do other drop-down menus, but it will not let you.