I prefer using &rel=0 as a YouTube parameter so that only MY videos get listed in the "More Videos" feature.

I have been using the following string in the WordPress editor for a couple of years and it has worked until a day or two ago.

;rel=0

Yes, many places inside WordPress "help" in converting that string to what some developer assumes I want, and removes the "rel=0" parameter. Today's result is an iframe like this:

<iframe title="Stress Pattern: 2-syllable verbs" width="700" height="394" src="" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></p>

What code stripped the "rel=0" ... and added all those strange "allow" parms?

I prefer using &rel=0 as a YouTube parameter so that only MY videos get listed in the "More Videos" feature.

I have been using the following string in the WordPress editor for a couple of years and it has worked until a day or two ago.

https://www.youtube/watch?v=PRw1q6aJtnQ&rel=0

Yes, many places inside WordPress "help" in converting that string to what some developer assumes I want, and removes the "rel=0" parameter. Today's result is an iframe like this:

<iframe title="Stress Pattern: 2-syllable verbs" width="700" height="394" src="https://www.youtube/embed/PRw1q6aJtnQ?feature=oembed" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe></p>

What code stripped the "rel=0" ... and added all those strange "allow" parms?

• php

• 1 This isn't something WP allows you to do unless you have the unfiltered_html capability, aka if you're an admin or a super admin on a multisite, and isn't how you're meant to do this. WP is supposed to strip things like iframes out of your content. – Tom J Nowell ♦ Commented Jan 22, 2020 at 12:33
• 1 Also, the rel parameter changed in 2018, it doesn't mean the same thing developers.google/youtube/…, which editor are you using? What did you change a day or two ago that triggered this? ( this wouldn't have just started happening unless code changed, unless you're actually on WordPress or a managed host? That's important info to know ), and how are you embedding it into the post? There are several ways to embed things from youtube, but you didn't state which one you were using – Tom J Nowell ♦ Commented Jan 22, 2020 at 12:33
• First: yes, rel=0 changed back in 2018, and I know exactly how it changed, I prefer the behavior it has had since that change. That's why I use it. – Bob Easton Commented Jan 22, 2020 at 14:59
• Second: the iframe code was produced by WordPress, not me. It's a fallacy to think that WordPress strips out iframes when it actually produces them for valid reasons. Third: The editor is the Visual editor, non-Gutenberg. What I changed that triggered this is NOTHING. WP base code and plugins are changing constantly. WP is producing different code in that iframe now than it did a few days ago My question stands: Where does that code come from? – Bob Easton Commented Jan 22, 2020 at 15:11
• Vitauts is correct: this is oEmbed. If you go to your video page on YouTube and search the page source for 'oEmbed' you'll find two links for json+oembed and xml+oembed: open one of those and you'll see the YouTube-provided iframe, e.g. here's the JSON version: youtube/… – Rup Commented Jan 22, 2020 at 17:11

1 Answer 1

Iframe content is generated by youtube itself, wordpress just requests it via oembed call. If you wish you can study wp-includes/class-oembed.php code, but that will not help you to change iframe parameters. For that you may apply embed_oembed_html filter, see https://developer.wordpress/reference/hooks/embed_oembed_html/. It receives iframe html code, so you can do some string replacements to change it.