Desktop

Thunderbird

Open source email client by the Mozilla Foundation, available for Windows, OS X/macOS, and Linux. Thunderbird displays emails using Gecko, the rendering engine used in the browser Firefox, also by Mozilla.

Tested in Thunderbird 52.3.0 on macOS.

Selectors
E:link
Media Queries
any-hover
any-pointer
hover
max-device-pixel-ratio
min-device-pixel-ratio
pointer
Text & Fonts
@font-face

Partial. User is prompted to download webfont, but only embedded (base64 encoded) fonts display.

EOT
SVG
TTF
WOFF
WOFF2
font-synthesis
text-size-adjust
Filters
backdrop-filter
Columns
break-after
break-before
break-inside
column-fill
column-span

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