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@viewport.orientation

The orientation CSS descriptor controls the orientation of a document defined by @viewport.

/* Keyword values */
orientation: auto;
orientation: portrait;
orientation: landscape;

For a UA/device where the orientation is changed upon tilting the device, an author can use this descriptor to inhibit the orientation change.

Related at-rule @viewport
Initial value auto
Percentages refer to the size of bounding box
Media as each of the properties of the shorthand:
Computed value as specified
Canonical order the unique non-ambiguous order defined by the formal grammar

Syntax

Values

auto
The user agent will set the document's orientation automatically, typically based on the device's orientation as determined by an accelerometer (if the device has such a hardware sensor), although there is often a user-controlled, OS-level "Lock orientation" setting that will trump the accelerometer reading.
portrait
The document should be locked into portrait orientation.
landscape
The document should be locked into landscape orientation.

Formal syntax

auto | portrait | landscape

Specifications

Specification Status Comment
CSS Device Adaptation
The definition of '"orientation" descriptor' in that specification.
Working Draft Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
Basic support No ? No 10
Prefixed
10
Prefixed
Prefixed Requires the vendor prefix: -ms-
No ?
Mobile
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support ? ? ? ? 8
Prefixed
8
Prefixed
Prefixed Requires the vendor prefix: -o-
? No

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/@viewport/orientation