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In firebug, you can use the cd command to change the console context to an iframe. I need this when developing a facebook app to debug my javascript inside the iframe.
How do you do this in google chrome?
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To open the developer console in Google Chrome, open the Chrome Menu in the upper-right-hand corner of the browser window and select More Tools > Developer Tools. You can also use Option + ⌘ + J (on macOS), or Shift + CTRL + J (on Windows/Linux).
At its simplest, the Sources tab allows you to set breakpoints and evaluate expressions in Javascript whether that Javascript was loaded from a separate file or was part of the page as illustrated in figure 1, below, which is a screen shot of the very simple Example 1.
No "cd" command yet, but it seems that we'll have a "dropdown list with all iframes to allow selecting current evaluation context for console expressions" in upcoming releases.
See http://trac.webkit.org/changeset/91839
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