mPDF font-size not working for long text in a table

Answer 1

If anyone still got the same issue after tested with accepted answer, try this :

<table style="overflow: wrap" autosize="1">

And

$mPdf->shrink_tables_to_fit = 1;

Hope this helped as my case was solved only with these combination

Answer 2

mPDF uses autosizing tables and this influences, among other things, the font-size as well. When outputting tables with mPDF you need to set:

<table style="overflow: wrap">

on every table. See Auto-layout algorithm in the mPDF manual for reference.