Question

HTML CSS里面为什么不能用 *{margin:0; padding:0;}？

Answer 1

星号代表 全部 就是全部样式的 外边距 和 内边距都为0； 意思就是写CSS之前把所有浏览器的默认样式统一了
然后在写CSS样式就OK了 这些样式叫重置文件
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, font, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td { border: 0 none; font-family: inherit; font-size: 100%; font-style: inherit; font-weight: inherit; margin: 0; outline: 0 none; padding: 0; }
:focus { outline: 0 none; }
table { border-collapse: collapse; border-spacing: 0; }
caption, th, td { font-weight: normal; text-align: left; }
a img, iframe { border: medium none; }
ol, ul { list-style: none outside none; }
input, textarea, select, button { font-family: inherit; font-size: 100%; }
body { font-family: "宋体"; font-size: 12px;}