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Asked: 2026-05-11T11:37:50+00:00

In firefox, using this javascript: top.location.hash = #here%20are%20spaces; changes the browser url to: http://mysite.com/#here

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In firefox, using this javascript:

top.location.hash = '#here%20are%20spaces';

changes the browser url to:

http://mysite.com/#here are spaces

I expected firefox to show the encoded spaces as %20 in the browser url.

  1. What’s going on here? Why is firefox not setting the url to the string as I passed it?
  2. How can I force firefox to update the url with the encoded characters?

and…

If I add set the url to 

top.location.hash = '#here%20are%20spaces%';

It works(!?), albeit with an extra unwanted % appended to the end. I am not sure if this is a bug or a feature. Ideas or references on how to proceed?

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1 Answer

  1. %20 are replaced with an empty space (in firefox 3) just for readability purpose. You shouldn’t worry about it.

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