Export to PDF doesn't respect heading size, font and type

Issue Summary

When you export a page to PDF, the headings in the PDF file doesn't match to the ones in the page in size, font and type.

Environment

New editor

Steps to Reproduce

1. Create a page and add some different headings
2. Export the page to PDF

Expected Results

The headings size, font and type in the PDF export match the ones in the page.

Actual Results

The headings in the PDF don't match the ones in the page.

Workaround

None.