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At what version did Mozilla Firefox start checking for glyph existence instead of just using character substitution fore requested fonts?




In doing some research I found that current browsers are terrible at rendering old web sites properly that included text from different languages that require different fonts.

In the past you could do something like this:
<span style="font-size:24.0pt;mso-bidi-font-size:10.0pt;
    font-family:Phoinike;color:blue">A<o:p></o:p></span>

And 'A' would be replaced by the glyph from location index 65 of the requested font.  At some point Firefox began to check if the font contains the 'A' glyph, and if not, the 'A' was then displayed in the default font vs the requested font.

So, as another example, it used to be that outputting "abc" with the Symbol font would display "αβγ".  This stopped along the way over the past 8 years or so.

When did this happen with Firefox?
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