[CSS] The floating thing
How elements float
The horizontal direction of the element floats, which means that the element can only move left and right but not up and down.
A floated element will move as far left or right as possible until its outer edge touches the border of the containing box or another floated box.
Elements after the floated element will surround it.
Elements before the floated element will not be affected.
Text
Floating is a state that is semi-detached from the document flow. It is not completely detached from the document flow like absolute positioning
Absolute positioning:
At this time, div1 has no height set. Although the height is set to 100px in div2, div2 cannot support the height of div1 because the absolute positioning is completely out of the document flow, and div1 cannot feel div2 at all;
Floating: the first case
We have set a left float in div2. If you do not clear the impact of div2's floating in div1, then you will not be able to expand the height of div1 because div1 cannot feel the floating.
But after you clear the float, div1 can feel the existence of the float (equivalent to the float now being in the document flow), and the height will be expanded.
Here are two solutions
Floating: the second case
Crazy and eccentric
Because the float (div2) can feel the
here, it can be displayed as it should; that is, the elements before the floating element will not be affected.
Floating: The third case
Psychosis
cannot feel the existence of float (div2), then
will be covered by float, but it is not completely covered.
We can find that the background of
is indeed covered, but the text content of
is not covered. This is also a weird thing about floating - floating will not cover the text in the document flow, but Other properties will be overridden.
Solution
Set a clear:left; for
to clear the effect of floating, so that
can feel the existence of (div2).
Crazy and crazy
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