WordPress at a glance
function is not described

_oembed_filter_feed_content() WP 4.4.0

Prepare the oembed HTML to be displayed in an RSS feed.

This is an internal function for using it by WP core itself. It's not recommended to use this function in your code.

No Hooks.

Return

String. The filtered content.

Usage

_oembed_filter_feed_content( $content );
$content(string) (required)
The content to filter.

Changelog

Since 4.4.0 Introduced.

Code of _oembed_filter_feed_content() WP 5.7.2

<?php
function _oembed_filter_feed_content( $content ) {
	return str_replace( '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted" style="position: absolute; clip: rect(1px, 1px, 1px, 1px);"', '<iframe class="wp-embedded-content" sandbox="allow-scripts" security="restricted"', $content );
}