Add/Fix http-equiv meta

[Jordan-T]

fix #575

[codecov]

Codecov Report

Merging #578 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #578   +/-   ##
=======================================
  Coverage   98.68%   98.68%           
=======================================
  Files          33       33           
  Lines         687      687           
  Branches      212      212           
=======================================
  Hits          678      678           
  Misses          5        5           
  Partials        4        4           

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[pimlie]

Thanks for your contrib!