It's Times New Roman but every seventh letter is jarringly sans serif. Original idea by ommanyte on Tumblr:
Times New Bastard is a modified version of Nimbus Roman No. 9 L and Nimbus Sans, original source here.
Turn on ligatures and optimiseLegibility:
font-feature-settings: "kern" on, "liga" on;
text-rendering: optimizeLegibility;
The font and related files in this directory are distributed under the GNU AFFERO GENERAL PUBLIC LICENSE Version 3 (see the file COPYING), with the following exemption:
As a special exception, permission is granted to include these font programs in a Postscript or PDF file that consists of a document that contains text to be displayed or printed using this font, regardless of the conditions or license applying to the document itself.