CSS -o- vendor extensions support in Opera Presto 2.8

The CSS specification allows for vendor-specific extensions. These are usually (but not exclusively) used for experimental additions to the CSS specification that have not yet reached Candidate Recommendation stage. The -o- prefix extension identifies an Opera experimental property or keyword.

Opera recommends that the final declaration of the property should be added to your style sheet if you use the unprefixed version. That way, future versions of the browser that include the feature after it becomes fully standardized can easily apply the style. See the following example.

-o-transform: scale(1.6);
transform: scale(1.6);

Recent changes:

For further reference, please see our Opera Developer Network blog article written by Bruce Lawson.

Opera Presto adds

Opera -o- vendor extensions

Please note that each vendor extended property is hyperlinked to its place in various CSS modules.

Property CSS module reference Support
-o-border-image CSS3 Backgrounds and Borders Module
Note: Opera only supports the border-image shorthand property with the use of the -o- prefix.
Yes
-o-device-pixel-ratio Note: This property is not yet part of a W3C CSS working draft or recommendation. It determines the resolution of a device's screen, and describes the aspect ratio of the output device. This value consists of two positive integers separated by a slash ("/") character, and represents the number of horizontal pixels over the number of vertical pixels. Yes
-o-linear-gradient() CSS3 Image Values and Replaced Content Module
Yes
-o-repeating-linear-gradient() CSS3 Image Values and Replaced Content Module
Yes
-o-object-fit CSS3 Image Values and Replaced Content Module
Note: Originally "image-fit", renamed to "object-fit".
Yes
-o-object-position CSS3 Image Values and Replaced Content Module
Note: Originally "image-position", renamed to "object-position".
Yes
-o-tab-size CSS3 Text Module Yes
-o-table-baseline MathML for CSS Profile Yes
-o-transform CSS3 2D Transforms Module Yes
-o-transform-origin CSS3 2D Transforms Module Yes
-o-transition CSS3 Transitions Module Partial
-o-transition-delay CSS3 Transitions Module Partial
-o-transition-duration CSS3 Transitions Module Partial
-o-transition-property CSS3 Transitions Module Partial
-o-transition-timing-function CSS3 Transitions Module Partial

Documentation

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