[whatwg] Please disallow "javascript:" URLs in browser address bars

Adam Barth w3c at adambarth.com
Thu Jul 22 13:46:00 PDT 2010

On Thu, Jul 22, 2010 at 1:41 PM, Aryeh Gregor <Simetrical+w3c at gmail.com> wrote:
> On Thu, Jul 22, 2010 at 4:32 PM, Luke Hutchison <luke.hutch at mit.edu> wrote:
>> There is no legitimate reason that non-developers would need to paste
>> "javascript:" URLs into the addressbar, and the ability to do so
>> should be disabled by default on all browsers.
> Sure there is: bookmarklets, basically.  javascript: URLs can do lots
> of fun and useful things.  Also fun but not-so-useful things, like:
> javascript:document.body.style.MozTransform=document.body.style.WebkitTransform=document.body.style.OTransform="rotate(180deg)";void(0);
> (Credit to johnath for that one.  Repeat with 0 instead of 180deg to
> undo.)  You can do all sorts of interesting things to the page by
> pasting javascript: URLs into the URL bar.  Of course, there are
> obviously security problems here too, but "no legitimate reason" is
> much too strong.

We could allow bookmarklets without allowing direct pasting into the
URL bar.  That would make the social engineering more complex at


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