參考文檔：瀏覽器默認HTML的CSS樣式屬性

以前一直在找這份文檔，今天偶然在w3上看到了。除了inline和block的定義，主要是要注意body|h1~h6|blockquote|menu|ul|ol|dd等標簽的默認樣式（margin和font-size）。

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 } 
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 } 
h1              { font-size: 2em; margin: .67em 0 } 
h2              { font-size: 1.5em; margin: .75em 0 } 
h3              { font-size: 1.17em; margin: .83em 0 } 
h4, p, 
blockquote, ul, 
fieldset, form, 
ol, dl, dir, 
menu            { margin: 1.12em 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 } 

/* Begin bidirectionality settings (do not change) */ 
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 } 

@media print { 
  h1            { page-break-before: always } 
  h1, h2, h3, 
  h4, h5, h6    { page-break-after: avoid } 
  ul, ol, dl    { page-break-before: avoid }

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