This makes /gcc-10/changes.html valid HTML5. Committed to CVS.
Index: htdocs/gcc-10/changes.html =================================================================== RCS file: /cvs/gcc/wwwdocs/htdocs/gcc-10/changes.html,v retrieving revision 1.2 diff -u -r1.2 changes.html --- htdocs/gcc-10/changes.html 13 May 2019 10:49:50 -0000 1.2 +++ htdocs/gcc-10/changes.html 13 May 2019 10:59:49 -0000 @@ -1,4 +1,5 @@ -<html> +<!DOCTYPE html> +<html lang="en"> <head> <title>GCC 10 Release Series — Changes, New Features, and Fixes</title> </head>