WP is invalidating my XHTML Strict valid post

FYI: On the web page in my previous reply ( http://ziphstric.com/wordpress-mangling-valid-xhtml-post.html ), I’ve added a link to the original post data (cut-and-pasted from the WP edit text field) which WP is mangling: wordpress-mangling-valid-xhtml-post-data.txt

Anonymous asked:
And can you have blockquote and cite together ?
Yes. Cite is an attribute on blockquote in XHTML 1.0 Strict.
Any Javascript I have came with WP. I’ve made very little customization.
Not sure what #4 is about. I attempted to put a relevant clips from a post that demonstrated the problem. I copy-and-pasted and then tried to get suitable markup for these forums, which I wasn’t able to do. Copy-and-paste is very valuable in revealing all details of a problem including subtle ones that otherwise might not be noticed. For example, Lane’s suggestion that I put two things on the same line that were on separate lines — had I abstracted the problem, that detail might have disappeared because that CR should be irrelevant.

Thanks to all for suggestions thus far. I had some coding work to do to make a good controlled experiment here. I wrote a script that verifies that all 58 of my posts is valid XHTML 1.0 Strict. So I’m starting clean here.
I then checked the validity of all 58 posts by having the w3.org validator check each individual post archive page. It is then checking for XHTML 1.0 Transitional. Six failed.
So I commented out these lines in wp-includes/template-functions-post.php :
//add_filter('the_content', 'convert_smilies');
//add_filter('the_content', 'convert_chars');
//add_filter('the_content', 'wpautop');
//
//add_filter('the_excerpt', 'convert_smilies');
//add_filter('the_excerpt', 'convert_chars');
//add_filter('the_excerpt', 'wpautop');
(commenting out the_excerpt filters probably wasn’t necessary)
Only one of the six is now valid. The other five are still invalid because of WP processing.
All five are good testcases because they have no comments. So, they only have what WordPress produces plus my valid posts.
http://ziphstric.com/blog/archives/2003/09/13/shiny-happy-people/
http://ziphstric.com/blog/archives/2003/09/16/forecasting-rain-on-the-parade/
http://ziphstric.com/blog/archives/2004/02/04/prefixsuffix-disambiguation-for-programmers/
http://ziphstric.com/blog/archives/2004/02/14/defining-heuristic/
http://ziphstric.com/blog/archives/2004/04/13/where-is-it-enumerated/
I then commented out the two commented-out statements shown below in the same file:
function the_content($more_link_text = '(more...)', $stripteaser = 0, $more_file = '') {
$content = get_the_content($more_link_text, $stripteaser, $more_file);
//$content = apply_filters('the_content', $content);
//$content = str_replace(']]>', ']]>', $content);
echo $content;
}
Now all my archive pages are valid. So there appears to be more filters than those add_filters at the top of template-functions-post.php which affect the_content.

Oops, forgot to login for that previous post. I wrote it (as is probably clear).

I’ve put the six posts that demonstrate problems into a new WP installation without any modifications that aren’t done simply via the admin panels:
http://ziphstric.com/wordpress/support-3-8153/index.php
Not only are the pagest generated by WP invalid, but some are corrupted such that the post content gets cut-off and is not displayed.
The links in the sidebar include links to pages with the uncorrupted post content for each of the six posts in question.

Beel, I’m unclear on what you are saying. Are you saying that I have a comment within a comment in my post data? (What do you mean be ‘script comment’ — you say we are back to it but I don’t see ‘script comment’ mentioned earlier in this forum thread? We did have the trouble in this thread with trying to capture XHTML snippets, but I don’t see that now. So I’m just flummoxed trying to understand what you are saying.)
I agree that nested comments in my post data would be invalid. I don’t see it. And w3.org’s and WDG’s validators are apparently both missing it as well if that’s the case. I’m thus disinclined to believe that I’m posting invalid data.
After WP processes my valid input, then all manner of things are wrong and invalid. That’s what I’m pointing out.
I do think there should be a mode where one can post valid data and not have WP make it invalid.