Opacity does not support percentage

[michaellisitsa]

Failure occurs in v59 of weasyprint. There is no support for percentage values, instead the print fails. I believe we should support it per https://developer.mozilla.org/en-US/docs/Web/SVG/Attribute/stroke-opacity or if that's too hard at least have a fallback incase its not a float.

Source code

It appears like the problem might be with trying to coerce the value to a float

WeasyPrint/weasyprint/svg/__init__.py

Line 634 in ff3b417

stroke_opacity = float(node.get('stroke-opacity', 1))

Failure log

File \"/usr/local/lib/weasyprint/.venv/lib/python3.8/site-packages/weasyprint/svg/__init__.py\", line 633, in fill_stroke\n    stroke_opacity = float(node.get('stroke-opacity', 1))\nValueError: could not convert string to float: '40%'\n",

[liZe]

Hi!

Thanks for the bug report.

All opacity and *-opacity properties should allow percentages, in SVG and CSS, as defined in CSS Color Level 4.

Correctly handling errors in SVG is not done yet, so I’m not sure that we’ll implement a nice fallback just here. But handling percentages will definitely fix your problem.