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[css-syntax][cssom][css-values] Asymmetry of parsing and serializing numbers #5880

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bernhardf-ro opened this issue Jan 19, 2021 · 0 comments
Open

[css-syntax][cssom][css-values] Asymmetry of parsing and serializing numbers #5880

bernhardf-ro opened this issue Jan 19, 2021 · 0 comments
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css-syntax-3 cssom-1 Current Work

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@bernhardf-ro
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According to [css-syntax]4.3.12.&4.3.13. as well as [css-values]5. numbers are parsed and processed with the maximum possible precision.
However, [cssom]6.7.2. specifies a maximum precision of 6 digits (7th for rounding) for serialization.

So serializing and re-parsing can change values. For example, JavaScript modifications of style sheets can have unexpected and unavoidable side-effects.

To demonstrate a worst-case: image-orientation:44.99999deg computes to 0deg, but after serialization and re-parsing computes to 90deg, as it was rounded to 45deg.

So the question is: Should parsing also limit precision or is there a different solution?
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Labels
css-syntax-3 cssom-1 Current Work
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@fantasai @bernhardf-ro