Google Chrome

Chrome Extensions for Software Testing

Content Scripts
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Chrome Extension

WAVE Browser Extensions

The following extension would injected the content script into http: Glob properties follow a different, more flexible syntax than match patterns. Acceptable glob strings are URLs that may contain "wildcard" asterisks and question marks. For example, the glob http: This extension would inject the content script into http: Although the execution environments of content scripts and the pages that host them are isolated from each other, they share access to the page's DOM.

If the page wishes to communicate with the content script, or with the extension via the content script, it must do so through the shared DOM. An example can be accomplished using window. The non-extension page, example.

This message is intercepted and inspected by the content script and then posted to the extension process. In this way, the page establishes a line of communication to the extension process. The reverse is possible through similar means. While isolated worlds provide a layer of protection, using content scripts can create vulnerabilities in an extension and the web page. If the content script receives content from a separate website, such as making an XMLHttpRequest , be careful to filter content cross-site scripting attacks before injecting it.

Be sure to filter for malicious web pages. For example, the following patterns are dangerous: Might be evaluating an evil script! What Can You Publish? Work in Isolated Worlds Content scripts live in an isolated world, allowing a content script to makes changes to its JavaScript environment without conflicting with the page or additional content scripts. An extension may run in a web page with code similar to the example below.

Specifies which pages this content script will be injected into. See Match Patterns for more details on the syntax of these strings and Match patterns and globs for information on how to exclude URLs. The list of CSS files to be injected into matching pages.

These are injected in the order they appear in this array, before any DOM is constructed or displayed for the page. The list of JavaScript files to be injected into matching pages. These are injected in the order they appear in this array.

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Understand Content Script Capabilities