When reading mail/news in Gnus, HTML messages sometimes have patches of missing background colour. That is, there are patches where the window background colour shows through. This problem is not apparent in Emacs 24. The problem does not seem to happen where there is text in the foreground. Rather, the HTML background colour is missing on some lines after the text ends, from the end of the text to the right edge of the window (or block). [This is with left-to-right text.] The attachment example-1_Emacs-25.png shows an example of this problem. (The window background colour is black and the HTML is painting a grey background colour.) The attachment example-1_Emacs-24.png shows the same message correctly displayed in Emacs 24.5. The attachment example-2_Emacs-25.png shows another example of the problem, while the attachment example-2_Emacs-24.png shows the same message correctly displayed in Emacs 24.5. Note: I have shr-use-fonts set to nil, and this seems to make the problem worse (than with shr-use-fonts non-nil). But the problem still occurs sometimes with non-nil shr-use-fonts. The attachment example-2-b_Emacs-25.png shows the problem with non-nil shr-use-fonts. FWIW, I attach the two example messages in raw form, in case they should be useful for reproducing the problem. In GNU Emacs 25.0.90.1 (x86_64-unknown-linux-gnu, GTK+ Version 3.18.7) of 2016-01-31 built on moondust Windowing system distributor 'Fedora Project', version 11.0.11800000 System Description: Fedora release 23 (Twenty Three) Configured using: 'configure --prefix=/home/nlj/local/ --enable-checking=yes,glyphs 'CFLAGS=-O0 -g3 -ggdb'' Configured features: XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND DBUS GCONF GSETTINGS NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 Important settings: value of $LC_MONETARY: en_DK.utf8 value of $LC_NUMERIC: en_DK.utf8 value of $LC_TIME: en_DK.utf8 value of $LANG: en_CA.UTF-8 value of $XMODIFIERS: @im=ibus locale-coding-system: utf-8-unix Major mode: Text Minor modes in effect: flyspell-mode: t recentf-mode: t display-battery-mode: t display-time-mode: t save-place-mode: t delete-selection-mode: t show-paren-mode: t savehist-mode: t electric-pair-mode: t desktop-save-mode: t cua-mode: t tooltip-mode: t 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