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What new units are added in css3
- 青灯夜游Original
- 2022-01-12 17:17:072089browse
New units added in css3: 1. "ch", the width of character 0; 2. "rem", a relative unit, mainly relative to the size of the root element font; 3. "vw", the window Width; 4. "vh", window height; 5. "vmin"; 6. "vmax", etc.
The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.
New length units in CSS3
The new length units in CSS3 are as follows,
-
ch, the width of character 0 rem, is a relative unit, mainly relative to the size of the root element font, To use rem, we need to refer to the specified root element.vw, viewpoint width, window width, 1vw=1% of the window widthvh, viewpoint height, window height, 1vh=1% of the window heightvmin,vmax, etc.
The newly added viewpoint-related units are generally targeted at mobile devices.
rem is actually the same thing as em, except that rem has an additional restriction, which represents the root element (html element) font-size. We can take a look at the difference between
rem and em through the following example,
<html style="font-size: 12px;">
<body>
<div id="div1" style="font-size: 16px">
<div id="div2" style="font-size: 1.2em"></div>
<div id="div3" style="font-size: 1.2rem">
<div id="div4" style="font-size: 1.2em"></div>
</div>
</div>
</body>
</html>At this time,
font-size of div2:
16px*1.2em=19.2px- ##font-size of div3:
12px*1.2 rem=14.4px
- font-size of div4:
12px*1.2rem*1.2em=17.28px
rem does not have a cascading relationship, but em does.
rem units.
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