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I'm not sure if is wordpress itself or Tiny MCE that's doing it. But when switching between HTML and Visual editor it's adding  , and adding an extra one each time I switch back and forth. I don't even have a line break in the code, it seems to somehow be deciding where it wants to place them based on the tags in my html code.

What's causing this and how do I fix it?

I've already tried this in the template functions file:

//disable auto p
remove_filter ('the_content', 'wpautop');
remove_filter ('comment_text', 'wpautop');
// Remove auto formatting
remove_filter('the_content', 'wptexturize');
remove_filter('comment_text', 'wptexturize');
remove_filter('the_title', 'wptexturize');
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migrated from Sep 28 '11 at 11:22

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It's actually doing this automatically when you switch tabs, I noticed it too, and found it very annoying. No clue on how to fix it yet though... – Joost de Valk Sep 28 '11 at 15:17
I use the HTML editor almost exclusively, pasting code in there from BBEdit. It seems to do this to me when I save in WP. – neilfein Oct 25 '11 at 19:30
well I have this problem too. When I post manually and click enter button, it will add paragraph for me. This happens after i installed tiny mce. What do you mean by this anyway: Filter tiny_mce_init, to override the default content-filtering rules – user15672 Apr 30 '12 at 10:19

4 Answers 4

up vote 1 down vote accepted

All I use is remove_filter( 'the_content', 'wpautop' ); remove_filter( 'the_excerpt', 'wpautop' ); and that stops Wordpress from creating any extra markup. Are you copying and pasting your code from an external editor?

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didn't work for me. Without using Tiny MCE, just in HTML each "update" still adds new  s – Christian Jun 17 '12 at 14:34
Also doesn't work for me – sidonaldson Oct 27 at 10:44

What's causing this and how do I fix it?

Any content added to or removed from your Post Content is caused by tiny_mce_init, which is applying is's content-filtering rules.

The ways to prevent it are:

  1. Filter tiny_mce_init, to override the default content-filtering rules
  2. Stop switching between Visual and HTML editors. Really; unless you want to use option #1 above, don't switch between editors. WordPress is intended to be used such that content is entered using the Visual or the HTML editor, but not both simultaneously.

Example use for the tiny_mce_before_init filter in Codex. Another example of TinyMCE configuration/customization in Codex here.

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I'm pretty sure that your #2 answer is wrong. That or someone "screwed the pooch" on the UI. If the editor was intended to only be used as Visual or HTML, why have the Tabs there at all? Why not just have it as an option under settings to use it one way or the other? Further more, the tabs are there by default... it's not some developer advanced feature or option you have to setup. I'm pretty sure they where intended for users to be able to click back and forth between and that the real problem is that sometimes they don't work well together. (especially in the case of space formatting) – luckykind Nov 18 '11 at 3:43
@luckykind No, they weren't intended to switch forth and back between them. That's just a TinyMCE architectural problem. And it's not the only one. – kaiser Oct 2 '13 at 12:38
You can't tell me that a UI that offers tabs to switch back and forth between HTML and Visual editing isn't intended to be used that way. It's almost 2016 and the issue is still there. – Eric J. 2 days ago

I found that non-breaking spaces are being inserted when I use two spaces after a period. The editor seems to interpret the extra space as an attempt on my part to use spaces for text formatting.

If I copy-and-paste my article from the Wordpress editor into a text editor that supports hex display (I use EditPad Pro), I see that text that I thought is a period followed by two spaces is in reality text followed by a single space, followed by the unicode character with the hex code A0, which is the Unicode NO-BREAK SPACE character.

I was able to remove the non-breaking space in existing articles by replacing space followed by the NO_BREAK SPACE character by just a space. In most text editors, you should be able to do that with search & replace by copying the "two spaces" into the Find text box and writing a single space into the Replace text box.

I was able to avoid the issue going forward by only typing a single space after a period.

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In css file. Put display: inline-flex to the p inside the excerpt. The additional white spaces don’t bother anymore. works for me

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