【第1章】参考: 1.1 tag comment; 1.2 tag doctype; 1.3 tag a; 1.4 tag abbr; 1.5 tag acronym; 1.6 tag address; 1.7 tag applet; 1.8 tag area; 1.9 tag article; 1.10 tag aside; 1.11 tag audio; 1.12 tag b; 1.13 tag base; 1.14 tag basefont; 1.15 tag bdi; 1.16 tag bdo; 1.17 tag big; 1.18 tag blockquote; 1.19 tag body; 1.20 tag br; 1.21 tag button; 1.22 tag canvas; 1.23 tag caption; 1.24 tag center; 1.25 tag cite; 1.26 tag code; 1.27 tag col; 1.28 tag colgroup; 1.29 tag command; 1.30 tag datalist; 1.31 tag dd; 1.32 tag del; 1.33 tag details; 1.34 tag dfn; 1.35 tag dialog; 1.36 tag dir; 1.37 tag div; 1.38 tag dl; 1.39 tag dt; 1.40 tag em; 1.41 tag embed; 1.42 tag fieldset; 1.43 tag figcaption; 1.44 tag figure; 1.45 tag font; 1.46 tag footer; 1.47 tag form; 1.48 tag frame; 1.49 tag frameset; 1.50 tag hn; 1.51 tag head; 1.52 tag header; 1.53 tag hr; 1.54 tag html; 1.55 tag i; 1.56 tag iframe; 1.57 tag img; 1.58 tag input; 1.59 tag ins; 1.60 tag kbd; 1.61 tag keygen; 1.62 tag label; 1.63 tag legend; 1.64 tag li; 1.65 tag link; 1.66 tag map; 1.67 tag mark; 1.68 tag menu; 1.69 tag meta; 1.70 tag meter; 1.71 tag nav; 1.72 tag noframes; 1.73 tag noscript; 1.74 tag object; 1.75 tag ol; 1.76 tag optgroup; 1.77 tag option; 1.78 tag output; 1.79 tag p; 1.80 tag param; 1.81 tag pre; 1.82 tag progress; 1.83 tag q; 1.84 tag rp; 1.85 tag rt; 1.86 tag ruby; 1.87 tag s; 1.88 tag samp; 1.89 tag script; 1.90 tag section; 1.91 tag select; 1.92 tag small; 1.93 tag source; 1.94 tag span; 1.95 tag strike; 1.96 tag strong; 1.97 tag style; 1.98 tag sub; 1.99 tag summary; 1.100 tag sup; 1.101 tag table; 1.102 tag tbody; 1.103 tag td; 1.104 tag textarea; 1.105 tag tfoot; 1.106 tag th; 1.107 tag thead; 1.108 tag time; 1.109 tag title; 1.110 tag tr; 1.111 tag track; 1.112 tag tt; 1.113 tag u; 1.114 tag ul; 1.115 tag var; 1.116 tag video; 1.117 tag wbr; 1.118 attribute accesskey; 1.119 attribute class; 1.120 attribute contenteditable; 1.121 attribute contextmenu; 1.122 attribute data; 1.123 attribute dir; 1.124 attribute draggable; 1.125 attribute dropzone; 1.126 attribute hidden; 1.127 attribute id; 1.128 attribute lang; 1.129 attribute spellcheck; 1.130 attribute style; 1.131 attribute tabindex; 1.132 attribute title; 1.133 attribute translate; 1.134 event onafterprint; 1.135 event onbeforeprint; 1.136 event onload; 1.137 event onresize; 1.138 event onunload; 1.139 event onblur; 1.140 event onchange; 1.141 event onfocus; 1.142 event onselect; 1.143 event onsubmit; 1.144 event onkeydown; 1.145 event onkeypress; 1.146 event onkeyup; 1.147 event onclick; 1.148 event ondblclick; 1.149 event onmousedown; 1.150 event onmousemove; 1.151 event onmouseout; 1.152 event onmouseover; 1.153 event onmouseup; 1.154 event onshow; 1.155 event ontoggle; 1.156 canvas fill style; 1.157 canvas stroke style; 1.158 canvas shadow color; 1.159 canvas shadow blur; 1.160 canvas shadow offsetx; 1.161 canvas shadow offsety; 1.162 canvas create linear gradient; 1.163 canvas create pattern; 1.164 canvas create radial gradient; 1.165 canvas add color stop; 1.166 canvas line cap; 1.167 canvas line join; 1.168 canvas line width; 1.169 canvas miter limit; 1.170 canvas rect; 1.171 canvas fill rect; 1.172 canvas stroke rect; 1.173 canvas clear rect; 1.174 canvas fill; 1.175 canvas stroke; 1.176 canvas begin path; 1.177 canvas move to; 1.178 canvas close path; 1.179 canvas line to; 1.180 canvas clip; 1.181 canvas quadratic curve to; 1.182 canvas bezier curve to; 1.183 canvas arc; 1.184 canvas arc to; 1.185 canvas is point in path; 1.186 canvas scale; 1.187 canvas rotate; 1.188 canvas translate; 1.189 canvas transform; 1.190 canvas set transform; 1.191 canvas font; 1.192 canvas text align; 1.193 canvas text baseline; 1.194 canvas fill text; 1.195 canvas stroke text; 1.196 canvas measure text; 1.197 canvas draw image; 1.198 canvas width; 1.199 canvas height; 1.200 canvas data; 1.201 canvas create image data; 1.202 canvas get image data; 1.203 canvas put image data; 1.204 canvas global alpha; 1.205 canvas global composite operation; 1.206 av add text track 方法; 1.207 av can play type 方法; 1.208 av load 方法; 1.209 av play 方法; 1.210 av pause 方法; 1.211 av audio tracks 属性; 1.212 av auto play 属性; 1.213 av buffered 属性; 1.214 av controller 属性; 1.215 av controls 属性; 1.216 av current src 属性; 1.217 av current time 属性; 1.218 av default muted 属性; 1.219 av default play back rate 属性; 1.220 av duration 属性; 1.221 av ended 属性; 1.222 av error 属性; 1.223 av loop 属性; 1.224 av media group 属性; 1.225 av muted 属性; 1.226 av network state 属性; 1.227 av paused 属性; 1.228 av play back rate 属性; 1.229 av played 属性; 1.230 av preload 属性; 1.231 av ready state 属性; 1.232 av seekable 属性; 1.233 av seeking 属性; 1.234 av src 属性; 1.235 av start date 属性; 1.236 av text tracks 属性; 1.237 av video tracks 属性; 1.238 av volume 属性; 1.239 av abort 事件; 1.240 av can play 事件; 1.241 av can play through 事件; 1.242 av duration change 事件; 1.243 av ended 事件; 1.244 av error 事件; 1.245 av loaded data 事件; 1.246 av loaded metadata 事件; 1.247 av load start 事件; 1.248 av pause 事件; 1.249 av play 事件; 1.250 av playing 事件; 1.251 av progress 事件; 1.252 av rate change 事件; 1.253 av seeked 事件; 1.254 av seeking 事件; 1.255 av stalled 事件; 1.256 av suspend 事件; 1.257 av time update 事件; 1.258 av volume change 事件; 1.259 av waiting 事件; 1.260 attr a charset; 1.261 attr a coords; 1.262 attr a download; 1.263 attr a href; 1.264 attr a hreflang; 1.265 attr a media; 1.266 attr a name; 1.267 attr a rel; 1.268 attr a rev; 1.269 attr a shape; 1.270 attr a target; 1.271 attr a type; 1.272 attr area alt; 1.273 attr area coords; 1.274 attr area href; 1.275 attr area hreflang; 1.276 attr area media; 1.277 attr area nohref; 1.278 attr area rel; 1.279 attr area shape; 1.280 attr area target; 1.281 attr area type; 1.282 attr audio autoplay; 1.283 attr audio controls; 1.284 attr audio loop; 1.285 attr audio muted; 1.286 attr audio preload; 1.287 attr audio src; 1.288 attr base href; 1.289 attr base target; 1.290 attr basefont color; 1.291 attr basefont face; 1.292 attr basefont size; 1.293 attr bdo dir; 1.294 attr body alink; 1.295 attr body background; 1.296 attr body bgcolor; 1.297 attr body link; 1.298 attr body text; 1.299 attr body vlink; 1.300 attr button autofocus; 1.301 attr button disabled; 1.302 attr button form; 1.303 attr button formaction; 1.304 attr button formenctype; 1.305 attr button formmethod; 1.306 attr button formnovalidate; 1.307 attr button formtarget; 1.308 attr button name; 1.309 attr button type; 1.310 attr button value; 1.311 attr canvas height; 1.312 attr canvas width; 1.313 attr caption align; 1.314 attr col align; 1.315 attr col char; 1.316 attr col charoff; 1.317 attr col span; 1.318 attr col valign; 1.319 attr col width; 1.320 attr colgroup align; 1.321 attr colgroup char; 1.322 attr colgroup charoff; 1.323 attr colgroup span; 1.324 attr colgroup valign; 1.325 attr colgroup width; 1.326 attr command checked; 1.327 attr command disabled; 1.328 attr command icon; 1.329 attr command label; 1.330 attr command radiogroup; 1.331 attr command type; 1.332 attr del cite; 1.333 attr del datetime; 1.334 attr details open; 1.335 attr dialog open; 1.336 attr dir compact; 1.337 attr div align; 1.338 attr embed height; 1.339 attr embed src; 1.340 attr embed type; 1.341 attr embed width; 1.342 attr fieldset disabled; 1.343 attr fieldset form; 1.344 attr fieldset name; 1.345 attr font color; 1.346 attr font face; 1.347 attr font size; 1.348 attr form accept; 1.349 attr form accept charset; 1.350 attr form action; 1.351 attr form autocomplete; 1.352 attr form enctype; 1.353 attr form method; 1.354 attr form name; 1.355 attr form novalidate; 1.356 attr form target; 1.357 attr frame frameborder; 1.358 attr frame longdesc; 1.359 attr frame marginheight; 1.360 attr frame marginwidth; 1.361 attr frame name; 1.362 attr frame noresize; 1.363 attr frame scrolling; 1.364 attr frame src; 1.365 attr frameset cols; 1.366 attr frameset rows; 1.367 attr hn align; 1.368 attr hr align; 1.369 attr hr noshade; 1.370 attr hr size; 1.371 attr hr width; 1.372 attr iframe align; 1.373 attr iframe frameborder; 1.374 attr iframe height; 1.375 attr iframe longdesc; 1.376 attr iframe marginheight; 1.377 attr iframe marginwidth; 1.378 attr iframe name; 1.379 attr iframe sandbox; 1.380 attr iframe scrolling; 1.381 attr iframe seamless; 1.382 attr iframe src; 1.383 attr iframe srcdoc; 1.384 attr iframe width; 1.385 attr img align; 1.386 attr img alt; 1.387 attr img border; 1.388 attr img height; 1.389 attr img hspace; 1.390 attr img ismap; 1.391 attr img longdesc; 1.392 attr img src; 1.393 attr img usemap; 1.394 attr img vspace; 1.395 attr img width; 1.396 attr input accept; 1.397 attr input align; 1.398 attr input alt; 1.399 attr input autocomplete; 1.400 attr input autofocus; 1.401 attr input checked; 1.402 attr input disabled; 1.403 attr input form; 1.404 attr input formaction; 1.405 attr input formenctype; 1.406 attr input formmethod; 1.407 attr input formnovalidate; 1.408 attr input formtarget; 1.409 attr input height; 1.410 attr input list; 1.411 attr input max; 1.412 attr input maxlength; 1.413 attr input min; 1.414 attr input multiple; 1.415 attr input name; 1.416 attr input pattern; 1.417 attr input placeholder; 1.418 attr input readonly; 1.419 attr input required; 1.420 attr input size; 1.421 attr input src; 1.422 attr input step; 1.423 attr input type; 1.424 attr input value; 1.425 attr input width; 1.426 attr ins cite; 1.427 attr ins datetime; 1.428 attr keygen autofocus; 1.429 attr keygen disabled; 1.430 attr keygen form; 1.431 attr keygen keytype; 1.432 attr keygen name; 1.433 attr label for; 1.434 attr label form; 1.435 atrr legend align; 1.436 attr li type; 1.437 attr li value; 1.438 attr link charset; 1.439 attr link href; 1.440 attr link hreflang; 1.441 attr link media; 1.442 attr link rel; 1.443 attr link rev; 1.444 attr link sizes; 1.445 attr link target; 1.446 attr link type; 1.447 attr map name; 1.448 attr menu label; 1.449 attr menu type; 1.450 attr meta charset; 1.451 attr meta content; 1.452 attr meta http equiv; 1.453 attr meta name; 1.454 attr meta schema; 1.455 attr meter form; 1.456 attr meter high; 1.457 attr meter low; 1.458 attr meter max; 1.459 attr meter min; 1.460 attr meter optimum; 1.461 attr meter value; 1.462 attr object align; 1.463 attr object border; 1.464 attr object data; 1.465 attr object form; 1.466 attr object height; 1.467 attr object hspace; 1.468 attr object name; 1.469 attr object type; 1.470 attr object usemap; 1.471 attr object vspace; 1.472 attr object width; 1.473 attr ol compact; 1.474 attr ol reversed; 1.475 attr ol start; 1.476 attr ol type; 1.477 attr optgroup disabled; 1.478 attr optgroup label; 1.479 attr option disabled; 1.480 attr option label; 1.481 attr option selected; 1.482 attr option value; 1.483 attr output for; 1.484 attr output form; 1.485 attr output name; 1.486 attr p align; 1.487 attr param name; 1.488 attr param value; 1.489 attr pre width; 1.490 attr html mainfest; 1.491 attr html xmlns; 1.492 attr progress max; 1.493 attr progress value; 1.494 attr q cite; 1.495 attr script async; 1.496 attr script charset; 1.497 attr script defer; 1.498 attr script src; 1.499 attr script type; 1.500 attr select autofocus; 1.501 attr select disabled; 1.502 attr select form; 1.503 attr select multiple; 1.504 attr select name; 1.505 attr select required; 1.506 attr select size; 1.507 attr source media; 1.508 attr source src; 1.509 attr source type; 1.510 attr style media; 1.511 attr style scoped; 1.512 attr style type; 1.513 attr table align; 1.514 attr table bgcolor; 1.515 attr table border; 1.516 attr table cellpadding; 1.517 attr table cellspacing; 1.518 attr table frame; 1.519 attr table rules; 1.520 attr table summary; 1.521 attr table width; 1.522 attr tbody align; 1.523 attr tbody char; 1.524 attr tbody charoff; 1.525 attr tbody valign; 1.526 attr td abbr; 1.527 attr td align; 1.528 attr td axis; 1.529 attr td bgcolor; 1.530 attr td char; 1.531 attr td charoff; 1.532 attr td colspan; 1.533 attr td headers; 1.534 attr td height; 1.535 attr td nowrap; 1.536 attr td rowspan; 1.537 attr td scope; 1.538 attr td valign; 1.539 attr td width; 1.540 attr textarea autofocus; 1.541 attr textarea cols; 1.542 attr textarea disabled; 1.543 attr textarea form; 1.544 attr textarea maxlength; 1.545 attr textarea name; 1.546 attr textarea placeholder; 1.547 attr textarea readonly; 1.548 attr textarea required; 1.549 attr textarea rows; 1.550 attr textarea wrap; 1.551 attr tfoot align; 1.552 attr tfoot char; 1.553 attr tfoot charoff; 1.554 attr tfoot valign; 1.555 attr th abbr; 1.556 attr th align; 1.557 attr th axis; 1.558 attr th bgcolor; 1.559 attr th char; 1.560 attr th charoff; 1.561 attr th colspan; 1.562 attr th headers; 1.563 attr th height; 1.564 attr th nowrap; 1.565 attr th rowspan; 1.566 attr th scope; 1.567 attr th valign; 1.568 attr th width; 1.569 attr thead align; 1.570 attr thead char; 1.571 attr thead charoff; 1.572 attr thead valign; 1.573 attr time datetime; 1.574 attr tr align; 1.575 attr tr bgcolor; 1.576 attr tr char; 1.577 attr tr charoff; 1.578 attr tr valign; 1.579 attr track default; 1.580 attr track kind; 1.581 attr track label; 1.582 attr track src; 1.583 attr track srclang; 1.584 attr ul compact; 1.585 attr ul type; 1.586 attr video autoplay; 1.587 attr video controls; 1.588 attr video height; 1.589 attr video loop; 1.590 attr video muted; 1.591 attr video poster; 1.592 attr video preload; 1.593 attr video src; 1.594 attr video width; 1.595 tag hgroup; 1.596 tag picture; 1.597 attr blockquote cite

第1章第24节 tag center

教程阅读运行代码

HTML <center> 标签

实例

<center>这个文本居中对齐。</center>

浏览器支持

所有主流浏览器都支持 <center> 标签。

标签定义及使用说明

HTML5 不支持 <center> 标签，请用 CSS 代替。

在 HTML 4.01 中，<center> 元素 已废弃。

<center> 对其所包括的文本进行水平居中。

提示和注释

提示：请使用 CSS 样式来居中文本！在 CSS 教程中您能了解到更多关于居中文本的细节。

HTML 4.01 与 HTML5之间的差异

HTML5 不支持 <center> 标签，HTML 4.01 已废弃 <center> 标签。

标准属性

在 HTML 4.01 中，<center> 标签支持如下标准属性：

属性	值	描述
class	classname	规定元素的类名
dir	rtl ltr	规定元素中内容的文本方向
id	id	规定元素的唯一 id
lang	language_code	规定元素中内容的语言代码
style	style_definition	规定元素的行内样式
title	text	规定元素的额外信息

如需完整的描述，请访问标准属性。

事件属性

在 HTML 4.01 中，<center> 标签支持如下事件属性：

属性	值	描述
onclick	script	当鼠标被单击时执行脚本
ondblclick	script	当鼠标被双击时执行脚本
onmousedown	script	当鼠标按钮被按下时执行脚本
onmousemove	script	当鼠标指针移动时执行脚本
onmouseout	script	当鼠标指针移出某元素时执行脚本
onmouseover	script	当鼠标指针悬停于某元素之上时执行脚本
onmouseup	script	当鼠标按钮被松开时执行脚本
onkeydown	script	当键盘被按下时执行脚本
onkeypress	script	当键盘被按下后又松开时执行脚本
onkeyup	script	当键盘被松开时执行脚本

如需完整的描述，请访问事件属性。

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