using :focus pseudo class on li or other element e

问题:

Is it possible to select an element that is focused, like a:focus or input:focus, but on the other element, such as div, li, span or else?

If it's not possible, how can it be substituted with a tag? I am trying to modify height of a li element when it's focused, tried with a, but the height won't change.

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Requested Info :

"Can you also explain how do you put focus on LI?"

Via css selector li:focus. See https://jsfiddle.net/s4nji/Rjqy5/.

回答1:

That's simple: just add a tabindex attribute to the elements which normally don't receive focus.

回答2:

You can't focus list items. Not even using a script. I've tried doing $("li:first").focus() but it doesn't do anything. CSS doesn't get set as if it was focussed. This simply means that you either can't focus list items or that :focus pseudo classes don't work on list items.

Put anchors inside list items

<ul>
    <li><a href="#">...</a></li>
    <li><a href="#">...</a></li>
    <li><a href="#">...</a></li>
    ...
</ul>

This will seemingly focus your list item but it will actually focus anchor tags.