由于各个浏览器有些互相规则不兼容的原因,前端工作者要做兼容各个浏览器的网页造就了初始化css代码: html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, f
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