Web/API/Touch/rotationAngle

Summary

Returns the rotation angle, in degrees, of the contact area ellipse defined by Touch.radiusX and Touch.radiusY. The value may be between 0 and 90. Together, these three values describe an ellipse that approximates the size and shape of the area of contact between the user and the screen. This may be a relatively large ellipse representing the contact between a fingertip and the screen or a small area representing the tip of a stylus, for example.

Note: This attribute has not been formally standardized. It is specified in the Touch Events – Level 2 Draft specification and not in Touch Events Recommendation. This attribute is not widely implemented.

Syntax

var angle = touchItem.rotationAngle;

Return value

angle: The number of degrees of rotation to apply to the described ellipse to align with the contact area between the user and the touch surface.

Example

The Touch.radiusX example includes an example of this property's usage.

Specifications

Specification	Status	Comment
Touch Events – Level 2	Draft	Non-stable version.

Browser compatibility

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`rotationAngle` Experimental'	Chrome Full support 43	Edge Full support ≤79	Firefox ?	IE No support No	Opera Full support Yes	Safari No support No	WebView Android Full support 43	Chrome Android Full support 43	Firefox Android Full support Yes	Opera Android Full support Yes	Safari iOS Full support Yes	Samsung Internet Android Full support 4.0

Legend

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.': Experimental. Expect behavior to change in the future.

Touch.rotationAngle by Mozilla Contributors is licensed under CC-BY-SA 2.5.