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Editorial Team
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Asked: 2026-06-14T12:51:12+00:00

I noticed some JavaScript code that inspects window.location.port was breaking in IE10 Platform Preview

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I noticed some JavaScript code that inspects window.location.port was breaking in IE10 Platform Preview 10.0.1008.16421 today.

For instance, in IE10, go to http://www.microsoft.com. Open up the developer tools and type in window.location.port and it returns 80. What happened? Why does IE10 suddenly return the integer 80 when all other IE browsers return the "" (empty string) on the same site? IE10 also returns 80 in all of the downlevel modes.

Compare the result for IE8/9 on http://www.microsoft.com : window.location.port is ""!

Any idea if this is a new behavior for IE10, a logged bug in the platform release, or a has-yet-to-be-reported bug?

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1 Answer

  1. Editorial Team

    This sounds like a bug, although I do not known of any such reported issue:

    The HTML5: 2.6.2 Parsing URLs states that “[the port] is the substring matched by the production, if any.”

    Furthermore, the HTML5: 2.6.6 Interfaces for URL manipulation section gives an example input of http://example.com/carrot#question%3f which specifies that the port should be "" – an (empty string).

    UPDATE

    This is a real bug: http://connect.microsoft.com/IE/feedback/details/817343/ie11-scripting-value-of-htmlanchorelement-host-differs-between-script-created-link-and-link-from-document

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