Which empty attributes get removed from SVG?

Any attribute whose value is "" or only whitespace — id, class, data-*, and others.

Is an empty attribute the same as a data- attribute?

No. Empty means blank value. Remove Data Attributes deletes every data-* key, even when it has a value.

Yes. Blank stroke/fill attributes are removed.

Yes. xmlns has a real value and is kept.

FAQ

Quick answers

Which empty attributes get removed from SVG?: Any attribute whose value is "" or only whitespace — id, class, data-*, and others.
Is an empty attribute the same as a data- attribute?: No. Empty means blank value. Remove Data Attributes deletes every data-* key, even when it has a value.
Do empty presentation attributes like stroke="" count?: Yes. Blank stroke/fill attributes are removed.
Will xmlns stay when I remove empty attributes?: Yes. xmlns has a real value and is kept.

Source

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React component

React Native (react-native-svg)

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