Web specifications support in Opera Presto 2.10

Last update
April 23, 2012
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Web specifications added since Opera Presto 2.9
Opera Presto web specification support pages


Opera Presto rendering engine

This document and its associated support tables apply specifically to the Opera Presto 2.10 rendering engine. It incorporates Opera Presto web specification support with the latest Core Milestone and integration point. Changes and additions occurring since Opera Presto 2.9 are identified with their specific Core Milestone integration points. Please see the following Core Milestone integration points added since Opera Presto 2.9 topic.

Opera desktop, device, and mobile products

Opera products use and depend upon various parts of the Opera Presto rendering engine and its web specification features. It is important to note that while the latest Opera Presto rendering engine has incorporated new web specification features, they may not have been added to the latest released versions of Opera products.

The Opera user agent string

Opera products will identify which Opera Presto version and core-integration-point they are using in their user agent string. Depending on your Opera product, the Opera user agent string is placed in the "About Opera" page, found by typing opera:about in the address bar, or by clicking "Help > About Opera" in the Menu.


Opera/9.80 (Windows NT 5.1; U; Edition Next; en) Presto/2.10.238 Version/12.xx

This example user agent string describes the Opera Presto 2.10 (Presto/2.10) rendering engine, incorporating core-integration-point 238 (.238).

A high-level overview of current web specifications support in Opera products is available on opera.com at: Web specifications support in Opera products: an overview.

Opera articles

For further reference, and where applicable, Opera web specification support table documents now contain hyperlinks to Opera technical articles written by leading subject matter experts. These are sourced from Opera's extensive developer website, dev.opera.com.

Web specifications added since Opera Presto 2.9

Important note

The following web specification items integrated into the Opera Presto rendering engine are identified with their (Presto/2.10.xxx) core-integration-point numbers. This identifies which web specifications are included with Opera product versions, as shown in their user agent strings. Please see the preceding description in The Opera user agent string topic, to associate Opera product versions with the Opera Presto core-integration-points they contain.

Implemented in core-integration-points 225 through 231


Implemented in core-integration-points 232 through 236

XMLHttpRequest Level 2

Implemented in core-integration-points 237 through 244

XMLHttpRequest, postMessage

Implemented in core-integration-points 245 through 250


Implemented in core-integration-points 251 through 261

WebRTC 1.0
WebRTC 1.0

Implemented in core-integration-points 262 through 266

Media Queries

Implemented in core-integration-points 267 through 271

HTML5 - Drag and Drop
HTML5 - Embedded Content

Implemented in core-integration-points 272 through 278

W3C Text Encoding
CSS3 - Animations and Transitions
DOM Events

Implemented in core-integration-points 279 through 294

Paged Overflow
Clipboard API

Opera web specification support pages

HTML5 support
<canvas> element
New Elements/Attributes/APIs
Session History & Navigation
Legacy encodings support
MathML support
CSS Profile
Networking Protocols support
Offline Web Apps support
Offline Web Applications
SVG support
CSS Properties
DOM Interfaces
Text and internationalization support
Text & Internationalization
Web Open Font Format support
Web SQL Database support
Web SQL Database
Web Storage API support
Web Storage API
Web Workers API support
Web Workers API
WebSocket API support
WebSocket API
Widgets support
Access Request Policy (W3C)
Interface (W3C)
Packaging & Config. (W3C)
URIs (W3C)
Format specification (Opera)
XML Digital Signatures
XML support


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