If you want to use inline encoding of icons for Presets or Styles here are some hints.

Examples:

• data:image/png;base64,...databytes...
• data:image/svg+xml;base64,...databytes...

You can use web tools to convert your image to the base64 code like ​this one.

If you use svg you should clean up the svg file before you convert it to the base64 code, to make the base64 a lot shorter. For windows you can use e.g. ​svg cleaner. When using this one you can use the "complete" preset to clean up the svg file but you need to disable Entferne unnötige Zeichen im "d"-Attribut (something like remove unneeded characters in "d"-attribute), otherwise JOSM cannot correctly handle the resulting code.

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