Filters the image HTML markup to send to the editor when inserting an image.
$htmlstring
$idint
$captionstring
$titlestring
$alignstring
$urlstring
$sizestring|int[]
$altstring
$relstring
$html = apply_filters( 'image_send_to_editor', $html, $id, $caption, $title, $align, $url, $size, $alt, $rel );
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Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/hooks/image_send_to_editor