Bad value X for attribute “version” on element “svg”.

The version attribute on the <svg> element is obsolete in SVG 2 and is no longer recognized as a valid attribute by the W3C HTML validator.

The version attribute was used in SVG 1.0 and SVG 1.1 to indicate which specification the SVG content conformed to, with values like "1.0" or "1.1". However, SVG 2 — which is the version used when SVG is embedded in HTML5 documents — dropped this attribute entirely. It never had any practical effect on how browsers rendered SVG content, so removing it is safe and has no impact on functionality.

Similarly, the baseProfile attribute and the xmlns:xlink namespace declaration are also obsolete when using inline SVG in HTML5. You can safely remove all three.

Bad Example

<svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="100" height="100">
  <circle cx="50" cy="50" r="40" fill="blue" />
</svg>

Fixed Example

<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100">
  <circle cx="50" cy="50" r="40" fill="blue" />
</svg>

If your SVG files are exported from tools like Illustrator, Inkscape, or Figma, they often include the version attribute by default. You can safely strip it out manually or use an SVG optimizer like SVGO to clean up unnecessary attributes automatically.

Learn more:

MDN Reference

MDN - SVG element

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MDN Reference

MDN - SVG Attribute: version

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