Describe the bug
When exporting annotation with Flashcard, the JSON line is undefined

    },
    undefined,
    {

To Reproduce
Steps to reproduce the behavior:

1. Annotate a line of text
2. Add a Flashcard with data on back and front
3. Export annotation as JSON
4. Search "undefined" you should get to that badly exported entry

Expected behavior

Fla

With CSS3 introducing content being set as list-style-type, this is being ignored by Weasyprint:

CSS:
ul {list-style-type: '-';} ul ul {list-style-type: '+';}

Console error:
WARNING: Ignored list-style-type:\"-\" at **, invalid value.
WARNING: Ignored list-style-type:\"+\" at **, invalid value.

Is your feature request related to a problem? Please describe.
I would like to use the select object function with the ctrl or shift key (as is common with other programs) to be able to select multiple objects. For example, I may want to change the color of 7 items in the document all to red.

Describe the solution you'd like
see above

Describe alternatives you've considered
Cu