鼠标悬停<li id="cloud">时无法显示<ul id="cloudmenu">的问题求助

Hey there! Let's break down why your CSS selector isn't working and get that menu showing up on hover.

The Root Problem #

Your current selector #cloud:hover #cloudmenu is a descendant selector — it only targets elements with the ID cloudmenu that are nested inside the #cloud <li>. But based on your description, #cloudmenu is on the next line (HTML line 51) right after #cloud (line 50), which means they're sibling elements (share the same parent), not parent-child. That's why the selector can't find it.

The Fixes #

Depending on your exact HTML structure, use one of these sibling selectors:

1. Adjacent Sibling Selector (+)
   Use this if #cloudmenu is immediately right after #cloud with no other elements in between:

   #cloudmenu {
     display: none;
   }
   
   #cloud:hover + #cloudmenu {
     display: grid;
   }
   

2. General Sibling Selector (~)
   Use this if there are other elements between #cloud and #cloudmenu:

   #cloudmenu {
     display: none;
   }
   
   #cloud:hover ~ #cloudmenu {
     display: grid;
   }
   

Quick Check to Confirm #

Double-check your HTML structure to make sure:

• #cloud and #cloudmenu share the same direct parent element
• #cloudmenu isn't accidentally nested inside another element (like a different <li> or <div>)

If your structure is more complex (e.g., the menu is nested elsewhere), you might need to adjust your selector hierarchy or use a small JavaScript snippet, but the sibling selectors should cover most cases matching your description.

内容的提问来源于stack exchange，提问作者veryslothysloth