例如父元素字体大小为 24px, 而子元素的字体大小定义为font-size: 0.5em, 则子元素的字体大小为 12px, 该单位通常用来定义具有伸缩响应的网页, 当你改变网页body的字体大小的时候, 其他的比如h1,h2. ..,p等元素字体的大小会跟着变化, 这样更能保证你的网页的视觉平衡. Rem Theremunit is similar toem, bu...
CSS - 子字体大小使用EM 使用不等于1的EM时,使所有嵌套列表项具有相同大小的最有效的方法是什么?例如,我希望此列表中的所有LI都要大小为UL的父级0.85EM。我必须为深度的每个“级别”创建一个单独的课程? <html> <head> <styletype="text/css"> li { font-size:0.85em; } </style> </head> <body> <...
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em is relative to the parent element's font size, while rem is relative to the root element's font size. How do you create a grid layout in CSS? Use display: grid; along with grid-template-rows and grid-template-columns. What property controls the visibility of an element?
The width can be set as a specific size (in px, pt, cm, em, etc) or by using one of the three pre-defined values: thin, medium, or thick. Theborder-widthproperty can have from one to four values (for the top border, right border, bottom border, and the left border). ...
Em’s aren’t just for fonts, it’s a unit of measure that you can use for any other length (height, width, etc). Elastic width sites use em values for everything, which essentially makes the site “zoomable”, meaning that when you bump the font-size up everything bumps up all ...
In the following snippet, we’re painting the body’s background purple when the viewport width is wider than 30em and narrower than 80em. If the viewport width does not match that range of values, then it will fallback to white. body { background-color: #fff; } @media (min-width:...
{ display: none; width: 3em; height: 3em; margin-left: 1em; margin-top: .5em; background-size: contain; background-image: url("https://drive.google.com/uc?export=view&id=0B6od18BhWGl5eWhtZzJUaFA0SjA"); background-repeat: no-repeat; } .header { width: 100%; height: 4em; ...
rem stands for root em. Similar to em, the main difference is that rem only references the font size of the root element on the page, which is the browser, rather than the parent’s font size. If you are unsure about your browser’s default font size, check with your browser’s sett...
Length values: px, pt, em, rem, vh, and moreLike the border-style property, the border-width property can have between one and four values. If only one value is defined, then it applies to all sides of the element. If two values are defined, then the first value represents the top...