inset-block-start
Baseline
Widely available
*
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2021年4月.
* Some parts of this feature may have varying levels of support.
CSS 属性 inset-block-start 定义了元素的块首偏移，并根据元素的书写模式、行内方向和文本朝向对应至实体偏移。根据 writing-mode、direction 和 text-orientation 所定义的值，此属性对应于 top、right、bottom 或 left 属性。
尝试一下
writing-mode: horizontal-tb;
writing-mode: vertical-rl;
writing-mode: horizontal-tb;
direction: rtl;
writing-mode: vertical-lr;
<section id="default-example">
<div class="example-container" id="example-element">
<div id="abspos">
I am absolutely positioned with inset-block-start: 50px
</div>
<p>
As much mud in the streets as if the waters had but newly retired from the
face of the earth, and it would not be wonderful to meet a Megalosaurus,
forty feet long or so, waddling like an elephantine lizard up Holborn
Hill.
</p>
</div>
</section>
#example-element {
border: 0.75em solid;
padding: 0.75em;
position: relative;
width: 100%;
min-height: 200px;
unicode-bidi: bidi-override;
}
#abspos {
background-color: yellow;
color: black;
border: 3px solid red;
position: absolute;
inset-block-start: 50px;
inline-size: 140px;
}
语法
css
/* 长度值 */
inset-block-start: 3px;
inset-block-start: 2.4em;
/* 包含块的宽度或高度的百分比 */
inset-block-start: 10%;
/* 关键词值 */
inset-block-start: auto;
/* 全局值 */
inset-block-start: inherit;
inset-block-start: initial;
inset-block-start: revert;
inset-block-start: revert-layer;
inset-block-start: unset;
取值
inset-block-start 属性的取值与 left 属性相同。
形式定义
| 初始值 | auto |
|---|---|
| 适用元素 | positioned elements |
| 是否是继承属性 | 否 |
| Percentages | logical-height of containing block |
| 计算值 | same as box offsets: top, right, bottom, left properties except that directions are logical |
| 动画类型 | a CSS data type are interpolated as real, floating-point numbers.">length, CSS data type are interpolated as real, floating-point numbers.">percentage or calc(); |
形式语法
inset-block-start =
auto |
<length-percentage>
<length-percentage> =
<length> |
<percentage>
示例
设置块首偏移
HTML
html
<div>
<p class="exampleText">示例文本</p>
</div>
CSS
css
div {
background-color: yellow;
width: 120px;
height: 120px;
}
.exampleText {
writing-mode: vertical-lr;
position: relative;
inset-block-start: 20px;
background-color: #c8c800;
}
结果
规范
| Specification |
|---|
| CSS Logical Properties and Values Level 1 # propdef-inset-block-start |
| CSS Positioned Layout Module Level 3 # propdef-inset-block-start |
浏览器兼容性
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参见
- 定义其他偏移的属性：
inset-block-end、inset-inline-start和inset-inline-end - 对应的实体属性：
top、right、bottom和left writing-mode、direction、text-orientation