Known parent div container, the parent container contains two child divs, add a clear floating (clear) div tag behind the two child div tags, inside the parent div tag (left and right sides/*css5 */) The float is cleared.
If there is a div container
<body> <div class="divcss5"> <div class="clear"></div>
</div> </body>
If I now set top:10px to the sub-container, the effect will not change, which means that the floating will not follow the top. left changes. What effect do I see when I set the relative position position:relative; to a subcontainer? Now the effect of the sub-container is still floating, but when I set margin-left:10px and left:10px respectively; I see that the sub-container will change the corresponding position according to the margin-left and left, and the same margin-top and top will changes occur.
That is to say, when the sub-container is set to float, and then setting margin to the sub-container will have an effect, setting left and top will have no effect. Only when the relative position is set to the sub-container, not only the margin will have an effect , left and top can also work, so does it mean that left and top only work when they are in relative positions? So now we will do an experiment. I deleted float:left;position:relative; in the sub-container. It will not float and there will be no relative position, and then write top:10px;left:10px; accordingly. The code is as follows: .clear{width: 200px;background: #f2e;color:#030617;height: 20px;top:50px;left:10px;}; The result is that the sub-container has not moved at all, so, it turns out, left , top only works when the relative position is set. Margin will work whether you set position or not.
Continuing the float floating above, if you now set inherit for float; the setting inherits the float attribute of the browser, what we see at this time is not floating, and it is on the left by default. The same setting of none initial will have no effect. Only if the subcontainer has floating left and right set, the subcontainer will float.
Next, we use another method to clear floats. The HTML code is still the above code, and the css code of the large container div is still the above code.divcss5{padding:10px 0;width: 100%; left: 50%;right: 50%;background: #007CB5;},
The code of the sub-container is still the above code: .clear{width: 200px;background: #f2e;color:#030617;height: 20px; float:left;}, what you see at this time is the floating effect, the sub-container floats on top of the large container. For the same principle, I still use clear:both; we can use the css pseudo-element: after, the following is a very Simple css code, write css pseudo-class for the parent container, code: .divcss5:after{content: "1";clear: both;display: block;}, at this time, what we see is that the large container is cleared Float, and you can see on the browser that the subcontainer is included inside the large container. Check the browser with F12 and you can see that after is included in the parent container. Therefore, it is equivalent to adding a clear to the parent container, but it is missing a div layer. This layer is implemented by .divcss5:after.
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