Characters such as "ęą" are not recognized on my docker container, they are just omitted. I use phantom js to convert an HTML page into thumbnail. Html page contains characters like "ęą" on the page. So while generating thumbnail from it Ogonek characters [ęą] are ignored. I am sure this mus be happening due to Ogonek font not installed on linux [I am using amazon linux]. So want to know the font packages which needs to be installed on amazon linux to enable support for Ogonek charecters.
Addition of below fonts from amazonlinux library worked for me ...
dejavu-fonts-common.noarch dejavu-lgc-sans-fonts.noarch dejavu-lgc-sans-mono-fonts.noarch dejavu-lgc-serif-fonts.noarch dejavu-sans-fonts.noarch dejavu-sans-mono-fonts.noarch dejavu-serif-fonts.noarch