[wp-trac] [WordPress Trac] #32138: WordPress 4.2 : Tor Browser’s and Canvas privacy warning prompt

[WordPress Trac]

#32138: WordPress 4.2 : Tor Browser’s and Canvas privacy warning prompt
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 Reporter:  bluetouff    |       Owner:
     Type:  enhancement  |      Status:  closed
 Priority:  normal       |   Milestone:
Component:  Emoji        |     Version:  4.2
 Severity:  normal       |  Resolution:  wontfix
 Keywords:               |     Focuses:
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Comment (by superpoincare):

 Replying to [comment:10 pento]:
 > No movement on the Tor ticket in well over a year. Unless they change
 something, there's nothing we can do.

 The ticket in Tor forums using fonts got me thinking ...

 Adobe blank is a font which has zero width. This can be used to detect if
 the browser has used a system font or the fallback, which is Adobe Blank.

 Or a subset of Adobe Blank.

 From: https://blog.typekit.com/2013/03/28/introducing-adobe-blank/

 >1. Include Adobe Blank as a data URI in the CSS file.
 >
 >2. Specify ‘font-family: SomeWebFont, “Adobe Blank” in the CSS rule for
 some DOM element that contains >text (and would therefore have a non-zero
 width when rendered using a regular font). One example would >be a <span>
 element that is absolutely positioned offscreen.
 >3. Check the width of the DOM element. If it’s zero, SomeWebFont hasn’t
 loaded yet. If it’s greater than >zero, it has.

 I am not sure if this works or even how to implement it. Just thinking out
 loud.

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Ticket URL: <https://core.trac.wordpress.org/ticket/32138#comment:11>
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