Question about validating wphostingblog.nl/wordpress-hosting-vergelijken/ - elements not allowed

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Hi,

I just validated this URL:
http://wphostingblog.nl/wordpress-hosting-vergelijken/

Some errors came up and two of them I have a question about. What does
'element not allowed' exactly mean?

I know the elements are not allowed the way the are being used right now.
But the real question is: can they harm my website? Will some browsers
maybe show the webpage differently because of the poorly placed elements?

The exact messages were:

- Attribute xmlns:v not allowed here.

- Element style
<http://www.w3.org/html/wg/drafts/html/master/single-page.html#the-style-element>
not allowed as child of element div
<http://www.w3.org/html/wg/drafts/html/master/single-page.html#the-div-element>
in this context. (Suppressing further errors from this subtree.)

The website was built using WordPress. Should I ask the developers of the
theme to resolve these errors? Or can I accept them because they won't hurt
my WordPress website?

Kind regards,


Rick
http://wphostingblog.nl/

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<div dir=3D"ltr"><div><div><div>Hi,<br><br></div>I just validated this URL:=
 <a href=3D"http://wphostingblog.nl/wordpress-hosting-vergelijken/">http://=
wphostingblog.nl/wordpress-hosting-vergelijken/</a><br><br></div>Some error=
s came up and two of them I have a question about. What does &#39;element n=
ot allowed&#39; exactly mean?<br><br></div><div>I know the elements are not=
 allowed the way the are being used right now. But the real question is: ca=
n they harm my website? Will some browsers maybe show the webpage different=
ly because of the poorly placed elements?<br><br></div><div>The exact messa=
ges were:<br><br><span>- Attribute <code>xmlns:v</code> not allowed here.<b=
r></span><br><span>- Element <a href=3D"http://www.w3.org/html/wg/drafts/ht=
ml/master/single-page.html#the-style-element"><code>style</code></a> not al=
lowed as child of element <a href=3D"http://www.w3.org/html/wg/drafts/html/=
master/single-page.html#the-div-element"><code>div</code></a> in this conte=
xt. (Suppressing further errors from this subtree.)<br><br></span></div><di=
v><span>The website was built using WordPress. Should I ask the developers =
of the theme to resolve these errors? Or can I accept them because they won=
&#39;t hurt my WordPress website?<br><br></span></div><div><span>Kind regar=
ds,<br><br><br></span></div><div><span>Rick<br></span></div><div><a href=3D=
"http://wphostingblog.nl/">http://wphostingblog.nl/</a></div><br></div>

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