<tr> - HTML（超文本标记语言） 编辑

HTML <tr> 元素定义表格中的行。 同一行可同时出现<td> 和<th> 元素.

Content categories	None
Permitted content	Zero or more <td> or <th> elements, or a mix of them
Tag omission	Start tag is mandatory. End tag may be omitted if the <tr> element is immediately followed by a <tr> element, or if the parent table group (<thead>, <tbody> or <tfoot>) element doesn't have any more content
Permitted parents	<table>, <thead>, <tbody> or <tfoot> element
Permitted ARIA roles	Any
DOM interface	HTMLTableRowElement

Attributes

表格标签支持 全局特性。还有一些过期的特性，你应该避免使用它们，但是可以了解它们，会在你阅读旧代码的时候有所帮助。

align 已废弃 HTML4.01, 已废弃 HTML5

该枚举属性指定每个单元格中内容的水平对齐方式，可使用的属性值如下:

• left, 内容在单元格中左对齐
• center, 内容在单元格中居中
• right, 内容在单元格中右对齐
• justify, 增加文本内容之间的空白以伸展这行文本，使得该单元格中的多行文本具有相同的长度。
• char, aligning the textual content on a special character with a minimal offset, defined by the char and charoff attributes 未实现 (查看 bug 2212)

If this attribute is not set, the parent node's value is inherited.

Note: Do not use this attribute as it is obsolete (not supported) in the latest standard.

• To achieve the same effect as the left, center, right or justify values, use the CSS text-align property on it.
• To achieve the same effect as the char value, in CSS3, you can use the value of the char as the value of the text-align property 未实现.

bgcolor 已废弃 HTML4.01, 已废弃 HTML5

This attribute defines the background color of each cell of the row. It can be either an hexadecimal #RRGGBB or #RGB value or a color keyword. Usage note: the <tr> element should be styled using CSS. To give a similar effect to the bgcolor attribute, use the CSS property background-color.

char 已废弃 HTML4.01, 已废弃 HTML5

This attribute is used to set the character to align the cells in a column on. Typical values for this include a period (.) when attempting to align numbers or monetary values. If align is not set to char, this attribute is ignored. Note: Do not use this attribute as it is obsolete (and not supported) in the latest standard. To achieve the same effect as the char, in CSS3, you can use the character set using the char attribute as the value of the text-align property 未实现.

charoff 已废弃 HTML4.01, 已废弃 HTML5

This attribute is used to indicate the number of characters to offset the column data from the alignment characters specified by the char attribute. Note: Do not use this attribute as it is obsolete (and not supported) in the latest standard.

valign 已废弃 HTML4.01, 已废弃 HTML5

This attribute specifies the vertical alignment of the text within each row of cells of the table header. Possible values for this attribute are:

• baseline, which will put the text as close to the bottom of the cell as it is possible, but align it on the baseline of the characters instead of the bottom of them. If characters are all of the size, this has the same effect as bottom.
• bottom, which will put the text as close to the bottom of the cell as it is possible;
• middle, which will center the text in the cell;
• and top, which will put the text as close to the top of the cell as it is possible.

Note: Do not use this attribute as it is obsolete (and not supported) in the latest standard: instead set the CSS vertical-align property on it.

Examples

See <table> for examples on <tr>.

Specifications

Specification	Status	Comment
HTML Living Standard tr element	Living Standard
HTML5 tr element	Recommendation

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

• Desktop
• Mobile

Feature	Chrome	Edge	Firefox (Gecko)	Internet Explorer	Opera	Safari
Basic support	1.0	(Yes)	1.0 (1.7 or earlier)	(Yes)	(Yes)	(Yes)
align/valign attribute	1.0	(Yes)	未实现 [1]	(Yes)	(Yes)	(Yes)
char/charoff attribute	1.0	(Yes)	未实现 [2]	(Yes)	(Yes)	(Yes)
bgcolor attribute	未实现	未实现	未实现	(Yes)	未实现	未实现

Feature	Android	Edge	Firefox Mobile (Gecko)	IE Mobile	Opera Mobile	Safari Mobile
Basic support	(Yes)	(Yes)	1.0 (1.0)	(Yes)	(Yes)	(Yes)
align/valign attribute	?	(Yes)	未实现 [1]	?	?	?
char/charoff attribute	?	(Yes)	未实现 [2]	?	?	?
bgcolor attribute	未实现	未实现	未实现	(Yes)	未实现	未实现

[1] See bug 915.

[2] See bug 2212.

See also

• Other table-related HTML Elements: <caption>, <col>, <colgroup>, <table>, <tbody>, <td>, <tfoot>, <th>, <thead>;
• CSS properties and pseudo-classes that may be specially useful to style the <tr> element:
  • the :nth-child pseudo-class to set the alignment on the cells of the column;
  • the text-align property to align all cells content on the same character, like '.'.<