Issue #1913692 by mgifford: Convert Seven to HTML5.
Issue #1179764 by mjohnq3, mbrett5062, tim.plunkett: Convert Bartik to HTML5.
Issue #2011578 by mortendk, tlattimore, Cottser, soulston: Markup for Stark's page.html.twig + maintenance-page.html.twig.
Issue #1190206 by cosmicdreams: Convert taxonomy-term.html.twig to HTML5.
Followup: Issue #1913692 by mgifford: Convert Seven to HTML5.
Return the profile selection minimal to its hidden state.
Merge pull request #226 from jenlampton/117-installer-fix

Return the profile selection minimal to its hidden state.
Merge pull request #215 from hellomrcat/235

Issue #1913692 by mgifford: Convert Seven to HTML5.
Merge pull request #218 from jenlampton/html5-bartik

Issue #200: Backport Converting Bartik to HTML5.
Merge pull request #213 from hellomrcat/233

Issue #1190206 by cosmicdreams: Convert taxonomy-term.html.twig to HTML5.
Merge pull request #219 from jenlampton/html5-page

Issue #200: Backport Converting page.tpl.php & maintenance-page.tpl.php to HTML5.