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[Joachim Durchholz <jo@xxxxxxxxxxxxx>]

More information:

I have:
Mozilla Firefox 38.0
Web page that displays this behaviour: https://github.com/cbm755/sympy/commit/cad689d3b82aa332a55b601d1a004f26fa6108f6 , search for "assert upretty( Symbol('Fhat') ) == u('F" (without the quotes) and the problem is directly after that.
CSS-requested font list: Consolas,"Liberation Mono",Menlo,Courier,monospace
Used font: Liberation Mono is used

Interestingly, the combining character is immediately followed by a span:
<span class="pl-s"><span class="pl-pds">'</span>F̂<span class="pl-pds">'</span></span>
Wild guess: the span right after Unicode COMBINING HAT disrupts Mozilla's rendering engine in some way. (It would explain why the issue is hard to reproduce.)
Detail: The pl-pds span changes font color, to a color of the same value; i.e. this may or may not contribute to the situation.

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https://bugs.launchpad.net/bugs/51554

Title:
  Unicode combining characters don't combine properly.

Status in The Mozilla Firefox Browser:
  New
Status in firefox package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: firefox

  Load this Unicode test page:

  http://www.cl.cam.ac.uk/~mgk25/ucs/examples/UTF-8-demo.txt

  Scroll down to "Combining characters". The accents will appear to the
  right of the characters they're meant to appear directly over.

  I'm running firefox 1.5.dfsg+1.5.0.4-0ubuntu6.06 on Ubuntu Dapper.

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