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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
Summary
The block-size CSS property defines the horizontal or vertical size of an element's block depending on its writing mode. It corresponds to the width or the height property depending on the value defined for writing-mode.
If the writing mode is vertically oriented, the value of block-size relates to the width of the element, otherwise it relates to the height of the element. It relates to inline-size, which defines the other dimension of the element.
| Initial value | auto |
|---|---|
| Applies to | same as width and height |
| Inherited | no |
| Percentages | block-size of containing block |
| Media | visual |
| Computed value | same as width and height |
| Animation type | discrete |
| Canonical order | the unique non-ambiguous order defined by the formal grammar |
Syntax
/* <length> values */ block-size: 300px; block-size: 25em; /* <percentage> values */ block-size: 75%; /* Keyword values */ block-size: 25em border-box; block-size: 75% content-box; block-size: max-content; block-size: min-content; block-size: available; block-size: fit-content; block-size: auto; /* Global values */ block-size: inherit; block-size: initial; block-size: unset;
Values
The block-size property takes the same values as the width and height properties.
Formal syntax
<'width'>
Example
HTML Content
<p class="exampleText">Example text</p>
CSS Content
.exampleText {
writing-mode: vertical-rl;
background-color: yellow;
block-size: 200px;
}
Specification
| Specification | Status | Comment |
|---|---|---|
| CSS Logical Properties Level 1 The definition of 'block-size' in that specification. |
Editor's Draft | Initial definition |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | No support | 41.0 (41.0)[1] | No support | No support | No support |
| Feature | Android | Firefox Mobile (Gecko) | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|
| Basic support | No support | 41.0 (41.0)[1] | No support | No support | No support |
[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled, then disabled by default. The preference has been removed in Gecko 51 and this property cannot be disabled since this version.
See also
- The mapped physical properties:
widthandheight writing-mode