css属性在没有设置的时候，也是有值的，这就是默认值。列在下面，方便查看。
| 元素文章来源：https://www.toymoban.com/news/detail-824256.html |
默认的 CSS 值 |
|---|---|
| a:link |
|
| a:visited |
|
| a:link:active | color: (internal value); |
| a:visited:active | color: (internal value); |
| abbr | None. |
| address |
|
| area | display: none; |
| article | display: block; |
| aside | display: block; |
| audio | None. |
| b | font-weight: bold; |
| base | None. |
| bdi | None. |
| bdo | unicode-bidi: bidi-override; |
| blockquote |
|
| body |
|
| body:focus | outline: none; |
| br | None. |
| button | None |
| canvas | None. |
| caption |
|
| cite | font-style: italic; |
| code | font-family: monospace; |
| col | display: table-column; |
| colgroup | display: table-column-group |
| datalist | display: none; |
| dd |
|
| del | text-decoration: line-through; |
| details | display: block; |
| dfn | font-style: italic; |
| dialog | None. |
| div | display: block; |
| dl |
|
| dt | display: block; |
| em | font-style: italic; |
| embed:focus | outline: none; |
| fieldset |
|
| figcaption | display: block; |
| figure |
|
| footer | display: block; |
| form |
|
| h1 |
|
| h2 |
|
| h3 |
|
| h4 |
|
| h5 |
|
| h6 |
|
| head | display: none; |
| header | display: block; |
| hr |
|
| html |
|
| i | font-style: italic; |
| iframe:focus | outline: none; |
| iframe[seamless] | display: block; |
| img | display: inline-block; |
| input | None. |
| ins | text-decoration: underline; |
| kbd | font-family: monospace; |
| label | cursor: default; |
| legend |
|
| li | display: list-item; |
| link | display: none; |
| main | None. |
| map | display: inline; |
| mark |
|
| menu |
|
| menuitem | None. |
| meta | None. |
| meter | None. |
| nav | display: block; |
| noscript | None. |
| object:focus | outline: none; |
| ol |
|
| optgroup | None. |
| option | None. |
| output | display: inline; |
| p |
|
| param | display: none; |
| picture | None. |
| pre |
|
| progress | None. |
| q | display: inline; |
| q::before | content: open-quote; |
| q::after | content: close-quote; |
| rp | None. |
| rt | line-height: normal; |
| ruby | None. |
| s | text-decoration: line-through; |
| samp | font-family: monospace; |
| script | display: none; |
| section | display: block; |
| select | None. |
| small | font-size: smaller; |
| source | None. |
| span | None. |
| strike | text-decoration: line-through; |
| strong | font-weight: bold; |
| style | display: none; |
| sub |
|
| summary | display: block; |
| sup |
|
| table |
|
| tbody |
|
| td |
|
| template | None. |
| textarea | None. |
| tfoot |
|
| th |
|
| thead |
|
| time | None. |
| title | display: none; |
| tr |
|
| track | None. |
| u | text-decoration: underline; |
| ul |
|
| var | font-style: italic; |
| video | None. |
| wbr | None. |
小结
尽量记住这些默认值。文章来源地址https://www.toymoban.com/news/detail-824256.html
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