maybe place some code in the Page onbeforewrite that does a search replace to enter the space on $this->MyHTMLText

Thanks, but that's not ideal because the code will vary depending on each video setting, and obviously I can't do a find & replace just on a self closing tag or it would affect other code.

I'm not recommending a blanket acceptance of self closing tags - a regular expression matching something like "<iframe*vimeo*></iframe>" and you'd be able to identify the specific self-closing tags that you want to keep.

Ah, I misunderstood. That works a treat, thanks!

function onBeforeWrite() { 
$this->VimeoCode1 = str_replace("></iframe>", "> </iframe>", $this->VimeoCode1); 
parent::onBeforeWrite();
}

I've found that doing this:

function onBeforeWrite() {
$this->Content = str_replace("></iframe>", "> </iframe>", $this->Content);
parent::onBeforeWrite();
}

doesn't work because the content has already been loaded into the object using domdocument so it's already collapsed the iframe. I've used this regexp instead:

function onBeforeWrite() {
$this->Content = preg_replace('|<iframe(.*)/>|Uims', '<iframe\\1> </iframe>', $this->Content);
parent::onBeforeWrite();
}

I just want to confirm Chris' solution works, thanks!

Spoke too soon, didn't help. Instead I'm just putting an '&nbsp;' inside the iframe tags...not a great solution.

If someone's still having the same problem: I tried Chris's solution with ttyl's input - didn't work. It still removes the closing tag.

What did it for me (2.4.7) was the post from dendeffe on Page 1 of this thread.

Change the field form a HTMLText to a Text and use $myfield.RAW in the template. That's it.