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duplicate bordersMargin:0 0-1px-1px; (adjusts according to the border width)Position Absolute relative differenceAbsolute: The layer that is positioned for absolute is always relative to its nearest definition as the parent of absolute or relative, and the parent layer is not necessarily its immediate parent layer. If absolute or relative are not defined in their parent layer, they are positioned relative to the body.The relative:relative positioned layer is always relative to it

1 Development toolsSublinetext, Eclipse, Hbuilder2 browserInstall browser FireFox, ChromeInstall Firefox browser plugin: FireBug, Httprequester3 Common CodeOne.html"utf-8" > Learn to summarize HTML-01 development environment

Here simply write some of the attributes that are commonly used in typography, and you can learn to view them, or mark to see them later.font-family: "Micrsoft Yahei"; Set fontfont-size:20px; Set Font sizecolor:red; Set colorFont-weight:bold; Text BoldFont-style:italic; Text italicText-decoration:underline; Text underlineText-decoration:line-through; Text Delete LineText-indent:2em; Paragraph indentText-align; Center The paragraph layout is centered (