As far as I can tell it's a non-standard Webkit function. See https://bugzilla.m... | Hacker News

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mediumdeviation on March 15, 2013 | parent | context | favorite | on: Show HN: Weekend project, Intro.js

As far as I can tell it's a non-standard Webkit function. See https://bugzilla.mozilla.org/show_bug.cgi?id=403510 and https://gist.github.com/hsablonniere/2581101

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