[wp-trac] [WordPress Trac] #48698: Update fails if there’s a "Custom Html" block and an Iframe inside it

[WordPress Trac]

#48698: Update fails if there’s a "Custom Html" block and an Iframe inside it
--------------------------+------------------------------
 Reporter:  ozgurnevres   |       Owner:  (none)
     Type:  defect (bug)  |      Status:  new
 Priority:  normal        |   Milestone:  Awaiting Review
Component:  Editor        |     Version:  5.3
 Severity:  normal        |  Resolution:
 Keywords:                |     Focuses:
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Comment (by stidch):

 I also face an issue here with pages and iframes.

 My iframe is embedded in a shortcode. I cannot save any page, which
 contain a shortcode, which contain an iframe.

 For example:

 {{{
 onload="resizeIframe(this)"
 }}}


 In my case I try to resize an iframe with the advanced-iframe plugin. The
 full shortcode looks like this:

 {{{
 advanced_iframe src="https://xxx.com/script.php?parameter=value"
 frameborder="0" scrolling="no" onload="resizeIframe(this)"
 }}}


 In an html block above I'v defined the resizeIframe method.

 {{{
 <script>
 function resizeIframe(iframe) {
   iframe.height = "10px" // required for reducing the size
   iframe.height = iframe.contentWindow.document.body.scrollHeight + "px";
 }
 </script>
 }}}


 If I remove the part

 {{{
 onload="resizeIframe(this)
 }}}

 from the shortcode I can successfully save the page. With I can't.

 I've tried already with disabled plugins and default theme.

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Ticket URL: <https://core.trac.wordpress.org/ticket/48698#comment:5>
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