"chrome" in the protocol section of a URL

What does the following mean? I assume chrome refers to Google's webbrowser Chrome, but does it have its own special protocol (like http:// and ftp://)?

<iframe src="chrome://extension/content/web开发者_Go百科/web.htm" />"

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It has several meanings - Documentation

This is probably what you're looking for:

A chrome:// URL
An URL using the chrome:// protocol. Code loaded from a chrome URL has extended, or chrome,privileges. XUL-based applications load the code for their interface from chrome:// URLs.

Chrome privileges
The code running with chrome privileges is allowed to do everything, unlike the web content, which is restricted in several ways.

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It doesn't; chrome:// is a cue to what's known as a protocol handler. Basically, protocol handlers register a protocol scheme, and the browser will then pass off URLs matching that scheme to the handler.

One example of this functionality that you're probably familiar with is mailto:, which is not a protocol, but merely informs the browser to hand off the subsequent URI to a mail program.

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It's a special scheme used to refer to something inside the browser itself, or an add-on. There's probably no protocol per se, it just causes Chrome to access an internal resource in some way.

Also, "chrome" probably refers to "the stuff around the page" (i.e. the browser UI) rather than Google Chrome, although it is also what Google Chrome is named after. Firefox uses the same scheme for its internal things.