text-align

text-align CSS属性定义行内内容（例如文字）如何相对它的块父元素对齐。text-align 并不控制块元素自己的对齐，只控制它的行内内容的对齐。

/* Keyword values */
text-align: left;
text-align: right;
text-align: center;
text-align: justify;
text-align: justify-all;
text-align: start;
text-align: end;
text-align: match-parent;

/* Block alignment values (Non-standard syntax) */
text-align: -moz-center;
text-align: -webkit-center;

/* Global values */
text-align: inherit;
text-align: initial;
text-align: unset;

初始值	`start`, or a nameless value that acts as `left` if `direction` is `ltr`, `right` if `direction` is `rtl` if `start` is not supported by the browser.
适用元素	block containers
是否是继承属性	yes
计算值	as specified, except for the `match-parent` value which is calculated against its parent's `direction` value and results in a computed value of either `left` or `right`
Animation type	discrete

语法

text-align属性指定为从以下值列表中选择的单个关键字。

Values

start Experimental: 如果内容方向是左至右，则等于left，反之则为right。
end Experimental: 如果内容方向是左至右，则等于right，反之则为left。
left: 行内内容向左侧边对齐。
right: 行内内容向右侧边对齐。
center: 行内内容居中。
<string> Experimental: 第一个出现的该（单字符）字符串被用来对齐。跟随的关键字定义对齐的方向。例如，可用于让数字值根据小数点对齐。
justify: 文字向两侧对齐，对最后一行无效。
justify-all: 和justify一致，但是强制使最后一行两端对齐。
match-parent Experimental: 和inherit类似，区别在于start和end的值根据父元素的direction确定，并被替换为恰当的left或right。

指示语法

start | end | left | right | center | justify | match-parent

示例

查看在线演示

Live Examples

div { text-align: center; border:solid; }

p { background:gold; width:22em; }

some more inline content...

div { text-align: center; border:solid; }

p { background:gold; width:22em; margin: 1em auto; }

some more inline content...

div { text-align:-moz-center; text-align:-webkit-center; border:solid; }

p { background:gold; width:22em; }

some more inline content...

备注

居中一个块元素且不居中它的行内内容的标准兼容的方法是将它的左、右margin设为auto, 例如：

margin:auto; 或margin:0 auto; 或margin-left:auto; margin-right:auto;

示例

Left alignment

HTML

<p class="example">
  Integer elementum massa at nulla placerat varius.
  Suspendisse in libero risus, in interdum massa.
  Vestibulum ac leo vitae metus faucibus gravida ac in neque.
  Nullam est eros, suscipit sed dictum quis, accumsan a ligula.
</p>

CSS

.example {
  text-align: left;
  border: solid;
}

Result

Centered text

HTML

<p class="example">
  Integer elementum massa at nulla placerat varius.
  Suspendisse in libero risus, in interdum massa.
  Vestibulum ac leo vitae metus faucibus gravida ac in neque.
  Nullam est eros, suscipit sed dictum quis, accumsan a ligula.
</p>

CSS

.example {
  text-align: center;
  border: solid;
}

Result

Justify

HTML

<p class="example">
  Integer elementum massa at nulla placerat varius.
  Suspendisse in libero risus, in interdum massa.
  Vestibulum ac leo vitae metus faucibus gravida ac in neque.
  Nullam est eros, suscipit sed dictum quis, accumsan a ligula.
</p>

CSS

.example {
  text-align: justify;
  border: solid;
}

Result

Notes

The standard-compatible way to center a block itself without centering its inline content is setting the left and right margin to auto, e.g.:

.something {
  margin: auto;
}

.something {
  margin: 0 auto;
}

.something {
  margin-left: auto;
  margin-right: auto;
}

规范

规范	状态	备注
CSS Text Module Level 3 visibility	Candidate Recommendation	添加了`start`和`end关键字` keyword. Changed the unnamed initial value to `start` (which it was). Added the `<string>` value, the `match-parent` value and the `start end` double value.
CSS Level 2 (Revision 1) text-align	Recommendation	无改变
CSS Level 1 text-align	Recommendation	首次定义

浏览器兼容性

BCD tables only load in the browser

参见

margin:auto, margin-left:auto, vertical-align