Chrome Version       : 50.0.2661.94
URLs (if applicable) : http://jsbin.com/towazexetu/edit?html,output
Other browsers tested:
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari:
    Firefox: OK
         IE:

What steps will reproduce the problem?
(1) Configure your fontconfig with a set of fallbacks, e.g.:
<?xml version="1.0"?>
<!DOCTYPE fontconfig SYSTEM "fonts.dtd">
<fontconfig>
<alias>
    <family>serif</family>
    <prefer>
        <family>Merriweather</family>
        <family>cwTeXMing</family>
        <family>Symbola</family>
    </prefer>
</alias>
<alias>
	<family>sans-serif</family>
	<prefer>
		<family>Merriweather Sans</family>
		<family>Source Han Sans CN</family>
		<family>Symbola</family>
	</prefer>
</alias>
</fontconfig>
(2) Visit the URL: http://jsbin.com/towazexetu/edit?html,output

What is the expected result?
The glyphs not found for the serif font Merriweather should fallback to cwTeXMing and eventually Symbola.

What happens instead?
If a glyph is not found in Merriweather it takes another route and ends up fallbacking to Source Han Sans CN.

So basically it assumes the font cannot be used an continues in the list of font-families as soon as a glyph is not found, instead of going through all the fonts according to the fontconfig. I have tried putting a font after serif that has the glyph and then it will use that one. I assumes that the browser fall backs to sans-serif if no font-family matches and that is how it ends up matching the Source Han Sans CN.

 

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