Annoying warnings

[OrionRandD]

I've got some annoying warnings related to the postamble part when I publish any org file

(setq org-static-blog-page-postamble
"<div id="archive">
<a href="https://user.codeberg.page/rss.html\">RSS

user.com by user is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.

If you want to contact me, this is my email address:

<a href="mailto:user@gmail.com">VRFdS

")

Warnings buffer

line 242 column 149 - Warning: escaping malformed URI reference
line 242 column 413 - Warning: escaping malformed URI reference
line 250 column 1 - Warning: escaping malformed URI reference
line 250 column 1 - Warning: illegal characters found in URI
line 245 column 1 - Warning:

element removed from HTML5
line 248 column 1 - Warning: proprietary attribute "xmlns:dct"
line 248 column 1 - Warning: proprietary attribute "href"
line 250 column 1 - Warning: proprietary attribute "xmlns:cc"

How can I fix these warnings?
Because Emacs splits into two windows and opens up a new warning window buffer every time I publish an org file.

Also, I think that the image from this link is broken:
<a rel="license"href="https://creativecommons.org/licenses/by-sa/3.0/\"><img alt="Creative Commons License"
style="border-width:0"
src="https://i.creativecommons.org/l/by-sa/3.0/20x10.png\"

[bastibe]

Your issue seems to have some broken formatting and I can't quite make out what you are trying to ask. Could you rephrase your question?