通配符号的性能会很差，建议覆盖 特定的标签，例如
body, div, dl, dt, dd, ul, ol, li,
h1, h2, h3, h4, h5, h6, pre, pre,
form, fieldset, legend, input, button,
textarea, p, blockquote, th, td {
margin: 0;
padding: 0;
}
通配符号的性能会很差，建议覆盖 特定的标签，例如
body, div, dl, dt, dd, ul, ol, li,
h1, h2, h3, h4, h5, h6, pre, pre,
form, fieldset, legend, input, button,
textarea, p, blockquote, th, td {
margin: 0;
padding: 0;
}
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