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Summary
The HTML <bdo> Element (or HTML bidirectional override element) is used to override the current directionality of text. It causes the directionality of the characters to be ignored in favor of the specified directionality.
Usage Context
| Content categories | Flow content, phrasing content, palpable content. |
|---|---|
| Permitted content | Phrasing content. |
| Tag omission | 不允许，开始标签和结束标签都不能省略。 |
| Permitted parent elements | Any element that accepts phrasing content. |
| DOM interface | HTMLElement Up to Gecko 1.9.2 (Firefox 4) inclusive, Firefox implements the HTMLSpanElement interface for this element. |
Attributes
这个标签所包含的 全局属性.
dir- 这个标签包含文本的文本方向. 属性值可为:
ltr: 从左往右写，与现代汉语的书写习惯相同.rtl: 从右往左写，与古代汉语书写习惯相同.auto: 自动，由浏览器决定文字的排列方向.
示例
<!-- Switch text direction --> <p>This text will go left to right.</p> <p><bdo dir="rtl">This text will go right to left.</bdo></p>
结果
This text will go left to right.
.tfel ot thgir og lliw txet sihT.
Notes
The HTML 4 specification did not specify events for this element; they were added in XHTML. This is most likely an oversight.
Specifications
| Specification | Status | Comment |
|---|---|---|
| WHATWG HTML Living Standard <bdo> |
Living Standard | |
| HTML5 <bdo> |
Recommendation | |
| HTML 4.01 Specification <bdo> |
Recommendation |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | (Yes) | ? | ? | ? | (Yes) |