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Re:How We Got the Favicon (2017) by Jaruzel on Monday August 10, 2020 @12:15PM (#24110835)
You can set the shortcut icon meta tag to point to a fairly big (256x256) png file, and all modern browsers will re-scale it for use where-ever needed.

The only place where I've seen multiple sizes needed was for SPAs on mobile phones etc. and that's a whole different set of tags.

Re:How We Got the Favicon (2017) by im3w1l on Monday August 10, 2020 @12:23PM (#24110950)
Sometimes you want more control over the low-res result than a re-scale will give.
Re:How We Got the Favicon (2017) by kevin_thibedeau on Monday August 10, 2020 @06:02PM (#24114542)
Use SVG with CSS media queries.
Re:How We Got the Favicon (2017) by TeMPOraL on Tuesday August 11, 2020 @02:06AM (#24117582)
At the scales we're taking about, bitmap image is both faster and smaller than equivalent SVG & CSS with media queries.