Favicons

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I always put both a favicon.ico and a favicon.svg in the root of a website.

• Wikipedia
• Google Recommendation
  • multiple of 48: 48x48, 96x96, 144x144
  • No: 16x16
  • Specific tags in header of /: <link rel="icon" href="/favicon.svg" type="image/svg+xml">
• SVG conversion script using rsvg and icotool.
• favicon.fileformat.info - online tool to make an .ico file from an SVG
• How to Favicon (W3C, 2005)
• Favicon Cheatsheet (Audrey Feldroy, 2016ish)
• How to Favicon (Evil Martians, 2021)