在html中，即使我们没有指定页面元素显示的css样式，元素也会按照默认的的标准css样式去显示。因此掌握基本的html标签可以在一定程度上精简你的css代码，现将html标签的默认属性进行一定的汇总如下：

li              { display: list-item }  
head            { display: none }  
table           { display: table }  
tr              { display: table-row }  
thead           { display: table-header-group }  
tbody           { display: table-row-group }  
tfoot           { display: table-footer-group }  
col             { display: table-column }  
colgroup        { display: table-column-group }  
td, th          { display: table-cell; }  
caption         { display: table-caption }  
th              { font-weight: bolder; text-align: center }  
caption         { text-align: center }  
body            { margin: 8px; line-height: 1.12 } 

html, address, 
blockquote, 
body, dd, div, 
dl, dt, fieldset, form, 
frame, frameset, 
h1, h2, h3, h4, 
h5, h6, noframes, 
ol, p, ul, center, 
dir, hr, menu, pre   { display: block } 

h4, p, 
blockquote, ul, 
fieldset, form, 
ol, dl, dir, 
menu            { margin: 1.12em 0 } 

h1              { font-size: 2em; margin: .67em 0 }  
h2              { font-size: 1.5em; margin: .75em 0 }  
h3              { font-size: 1.17em; margin: .83em 0 }  
h5              { font-size: .83em; margin: 1.5em 0 }  
h6              { font-size: .75em; margin: 1.67em 0 }  
h1, h2, h3, h4, 
h5, h6, b, 
strong          { font-weight: bolder }  
blockquote      { margin-left: 40px; margin-right: 40px }  
i, cite, em, var, address    { font-style: italic }  
pre, tt, code, kbd, samp     { font-family: monospace }  
pre             { white-space: pre }  
button, textarea, input, object, select          { display:inline-block; }  
big             { font-size: 1.17em }  
small, sub, sup { font-size: .83em }  
sub             { vertical-align: sub }  
sup             { vertical-align: super }  
table           { border-spacing: 2px; }  
thead, tbody, tfoot           { vertical-align: middle }  
td, th          { vertical-align: inherit }  
s, strike, del  { text-decoration: line-through }  
hr              { border: 1px inset }  
ol, ul, dir, menu, dd        { margin-left: 40px }  
ol              { list-style-type: decimal }  
ol ul, ul ol, ul ul, ol ol    { margin-top: 0; margin-bottom: 0 }  
u, ins          { text-decoration: underline }  
br:before       { content: "\A" }  
:before, :after { white-space: pre-line }  
  
center          { text-align: center }  
abbr, acronym   { font-variant: small-caps; letter-spacing: 0.1em }  
:link, :visited { text-decoration: underline }  
:focus          { outline: thin dotted invert }  
    
@media print {  
  h1            { page-break-before: always }  
  h1, h2, h3, 
  h4, h5, h6    { page-break-after: avoid }  
  ul, ol, dl    { page-break-before: avoid } 
}

BDO[DIR="ltr"]  { direction: ltr; unicode-bidi: bidi-override }  
BDO[DIR="rtl"]  { direction: rtl; unicode-bidi: bidi-override }  
  
*[DIR="ltr"]    { direction: ltr; unicode-bidi: embed }  
*[DIR="rtl"]    { direction: rtl; unicode-bidi: embed }  

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当我们预想的css样式和默认样式一致时，我们就不必浪费不必要的css代码在那些页面元素上了，从而达到css代码的精简。

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