I've stumbled across an HTML meta tag I didn't know and wondered what it is for:

<link rel="fluid-icon" href="https://github.com/fluidicon.png" title="GitHub" />

I googled around, but couldn't find any explanation. What is this? A new favicon approach? And what's the difference to the one I already know:

<link rel="icon" href="images/2/mail_icon_32.png" sizes="32x32"> 
<link rel="shortcut icon" href="https://www.google.com/a/scoop-gmbh.de/images/favicon.ico" type="image/x-icon"> 

2 Answers 2


Fluid is a way of running web applications as if they were native Mac apps. The fluid icon is the one that displays on the Mac in the dock.

  • And what size is it supposed to be? E.g. in OQ the beknownst way of providing a favicon in a PNG format has sizes attribute, to know this.
    – s3c
    Apr 6, 2021 at 7:18

As an additional information to @paulmorriss answer:

The icon should be of size 512x512

Source: https://www.flickr.com/groups/fluid_icons/

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