Here are a few title options, focusing on the question of combining `:after` and `:hover`: Option 1 (Direct & Concise): * How to Create a Hovering Arrow using :after and :hover in CSS? Option 2

Combining :after with :hover

CSS offers a wide range of pseudo selectors that allow for targeted styling based on various criteria. One such selector is :after, which allows you to add elements after the selected element. Another commonly used pseudo selector is :hover, which targets elements when the cursor is hovering over them.

The question at hand seeks to combine :after with :hover to create an arrow shape that appears when an element is either selected or being hovered over. The original code provided in the question includes:

<code class="css">#alertlist li.selected:after {
  ...
}</code>

which applies styles to elements with the "selected" class. To add hovering functionality, we need to include a similar :after rule for elements that are hovered over:

<code class="css">#alertlist li.selected:after, #alertlist li:hover:after {
  ...
}</code>

By adding :after to the #alertlist li:hover selector, we ensure that the styles applied to the selected elements are also applied to elements being hovered over. The full code now looks like this:

<code class="css">#alertlist {
  ...
}

#alertlist li {
  ...
}

#alertlist li.selected,
#alertlist li:hover {
  ...
}

#alertlist li.selected:after, #alertlist li:hover:after {
  ...
}</code>

Now, the arrow shape will appear not only on elements with the "selected" class but also on elements that are being hovered over.

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