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 visual, continuous
Computed value as specified
Canonical order the unique non-ambiguous order defined by the formal grammar



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.
The document should be locked into portrait orientation.
The document should be locked into landscape orientation.

Formal syntax

auto | portrait | landscape


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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support No support 10 -ms No support ?
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? 8 -o ?

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