重置样式就是一组CSS声明，用来覆盖不同浏览器渲染HTML元素时的各种默认样式。
重置样式一般会被加入到主样式文件的开头，用来将各个浏览器的自有默认样式重置成统一表现，确保样式表中后续追加的样式在不同浏览器中有相同的显示效果。世界上没有完美的重置样式，许多开发者都有自己的一套。以下是Eric Merer的原版（http://meyerweb.com/eric/tools/css/reset/）:

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 {
    margin: 0;
    padding: 0;
    border: 0;
    outline: 0;
    font-weight: inherit;
    font-style: inherit;
    font-size: 100%;
    font-family: inherit;
    vertical-align: baseline;
}
: focus {
    outline: 0;
}
body {
    line-height: 1;
    color: black;
    background: white;
}
ol, ul {
    list-style: none;
}
table {
    border-collapse: separate;
    border-spacing: 0;
}
caption, th, td {
    text-align: left;
    font-weight: normal;
}
blockquote: before, blockquote: after,
q: before, q: after {
    content: "";
}
blockquote, q {
    quotes: "" "";
}