<pattern> in SVG work wrong in this project

[Justnormalguy]

I try to convert my SVG to a PDF, but it looks not right. So I try the MDN example, but it just empty.

Expected behavior
The PDF is empty, but the SVG shows correct.

Desktop (please complete the following information):

• OS: [Windows]
• Browser [chrome,]
• Version [online]

[HackbrettXXX]

Have you tried it outside the playground? The playground sanitizes the SVG before converting it and might remove the reference to the pattern.