On Nov 21, 2018, at 0:53, Eli Zaretskii <eliz@gnu.org> wrote:

From: Jean-Christophe Helary <brandelune@gmail.com>
Date: Tue, 20 Nov 2018 12:17:27 +0900

I just built master this morning and web-mode does not work as it did yesterday.

Did you really mean "master", i.e. the master branch?  Emacs 26.1.90
was produced from the emacs-26 branch, not from master.