Title: Minify HTML error
Last modified: January 8, 2018
---
# Minify HTML error
* Resolved [frizzel](https://wordpress.org/support/users/frizzel/)
* (@frizzel)
* [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/)
* When I enable HTML Minify Firefox tells me “Stray end tag ‘head'” and “‘body’
start tag seen, but element of the same type was already open”.
* I don’t see anything strange in the minified HTML, but when I disable minifying,
the errors are gone. I tried disabling JavaScript and CSS handling and only keep
HTML minifying: no change. I tried “Alternative HTML Minifying”, but that seems
to do no minifying at all.
* In the end I enabled Javascript and CSS handlers in this plug-in and use a separate
plug-in for html (‘Minify HTML’) and then: NO errors.
* So, I think something goes wrong in the minifying of HTML with this plug-in.
The question is, what exactly.
- This topic was modified 8 years, 5 months ago by [frizzel](https://wordpress.org/support/users/frizzel/).
Viewing 5 replies - 1 through 5 (of 5 total)
* Plugin Author [Raul P.](https://wordpress.org/support/users/alignak/)
* (@alignak)
* [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/#post-9843448)
* When you disable html minification, does your site validate on [https://validator.w3.org/](https://validator.w3.org/)?
* It looks like you’re missing some html tag or not closing one.
Our plugin uses
mrclay minify [https://github.com/mrclay/minify](https://github.com/mrclay/minify)
for this. The alternative version only removes extra linebreaks and spaces, it
works if your theme is not optimized.
* The html minify plugin probably uses something else.
* You’re the first person ever to report problems with this feature, and I know
it works perfectly on thousands of sites, having tested it with over 100 themes
myself.
* That being said, I’m always looking at ways of improving things.
* If you can validate the site on w3.org and there are no missing or closing tags,
then I’ll look into porting the library on html minify to my plugin.
* Thread Starter [frizzel](https://wordpress.org/support/users/frizzel/)
* (@frizzel)
* [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/#post-9843492)
* It’s on a local install at the moment.
* However, I noticed a difference between the 2 methods.
When your plug-in does
the minifying there’s a line (without any tags): ob_start_detected That comes
from All-In-One SEO Pack:
* ```
if ( $this->ob_start_detected ) {
echo 'ob_start_detected ';
}
```
* When I just make that echo line empty, there are no errors in the minifying.
I’m now only puzzled why your plug-in triggers this, and the other doesn’t.
* Thread Starter [frizzel](https://wordpress.org/support/users/frizzel/)
* (@frizzel)
* [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/#post-9843686)
* I see that you are using ob_start in the HTML Minify function which triggers
AIO SEO to echo that line.
* It’s probably more for their support forum, but FYI: it only happens when ‘Force
Rewrite’ in AIO SEO is set to ‘on’ (using output buffering).
However, I don’t
understand why they need to print that line as without it, it works just as well
as far as I can see.
- This reply was modified 8 years, 5 months ago by [frizzel](https://wordpress.org/support/users/frizzel/).
* Thread Starter [frizzel](https://wordpress.org/support/users/frizzel/)
* (@frizzel)
* [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/#post-9844343)
* FYI, I’ve opened a topic on AIO SEO support, too: it’s [here](https://wordpress.org/support/topic/ob_start-and-html-minifying-error/)
* Plugin Author [Raul P.](https://wordpress.org/support/users/alignak/)
* (@alignak)
* [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/#post-9844529)
* Thanks for letting me know about this.
* I use the AIO SEO in a couple of sites and never used the Force Rewrite option,
so I didn’t know.
* I think that line of code is some sort of debug option for their developers,
but they didn’t expect other plugins to use this function on the same hook and
level.
* I also don’t understand why it needs to be there, so thank you for opening the
topic on their forum.
Viewing 5 replies - 1 through 5 (of 5 total)
The topic ‘Minify HTML error’ is closed to new replies.
* 
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## Tags
* [html](https://wordpress.org/support/topic-tag/html/)
* [minifying](https://wordpress.org/support/topic-tag/minifying/)
* 5 replies
* 2 participants
* Last reply from: [Raul P.](https://wordpress.org/support/users/alignak/)
* Last activity: [8 years, 5 months ago](https://wordpress.org/support/topic/minfy-html-error/#post-9844529)
* Status: resolved