HTML and CSS Reference
In-Depth Information
#menu li ul {
position: absolute;
display: none;
left: 0;
}
[...]
#menu li:hover ul {
display: block;
}
Hiding Elements: display vs. visibility
Two ways hiding content can be accomplished are via the two
properties display:none and visibility:hidden . In the case of the
visibility property, the content continues to occupy the space in
the document flow that it would normally. For the display property,
since the element is no longer a block , inline , or other type, it is
removed from the document flow as if it didn't exist. Unless hold-
ing that space open for laying out other elements or maintaining its
properties such as height and width is important for other feature
of the page (like in some JavaScript interactions), display is typi-
cally used.
 
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