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So if you want valid HTML5 blog, then the first thing to do is to change the HTML code for the head on edit HTML.
Quite easy, just remove and replace the old code with new code. Now please go to your blog dashboard >> template >> edit HTML.
Do not forget to check the little box on the "Expand Widget Templates". Then please find the code below:
Usually the old version as head code below.
<! DOCTYPE html PUBLIC "- / / W3C / / DTD XHTML 1.0 Strict / / EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
Now please replace the code with the code below.
<! DOCTYPE html>
And lastly, please change the code </ html> at the bottom of the HTML blog </ HTML> . Similarly, just sharing how Replacing HTML code Valid HTML5 Head Blogger For it may be understandable and useful.