When making HTML5 pages, we often encounter that the page content is too small to support the entire height of the mobile phone screen.
We often use min-height for processing, such as min-height:568px; corresponding to the height of iPhone5;
In this way, there will be a blank space below iPhone6plus.
And if you set min-height:736px; iPhone5, a scroll bar will appear;
At this time we can use
position:absolute;left:0;right:0;top:0;bottom:0;
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