Biblatex package has undergone numerous changes because of its revision to version 3.0. The back-end namely biber (the modern equivalent of BibTeX program) which is needed to exploit all the features of biblatex has also been upgraded to a newer version with changes in the data structure of the resultant bibliographic listing file. Both these revisions have broken the functionality of current version of biblatex.4ht of TeX4ht bundle, causing panic among biblatex users, particularly, in the humanities world. This page in GitHub issue tracker of biblatex has a long exchange about the current issues. The noteworthy postings in this page are quoted below: