Missing URL for attribute ‘srcset’ in tag ‘amp-img’.

Hi @kunaldabi,
This workaround should prevent the srcset attribute from appearing at all when it is empty:

 /**
 * Prevents an empty 'srcset' attribute from appearing.
 *
 * @param array  $attributes Image attributes.
 * @return array $attributes Filtered image attributes.
 */
add_filter( 'wp_get_attachment_image_attributes', function( $attributes ) {
	if ( function_exists( 'is_amp_endpoint' ) && is_amp_endpoint() && empty( $attributes['srcset'] ) ) {
		unset( $attributes['srcset'] );
	}
	return $attributes;
} );

It’s a little strange that the featured image isn’t displaying on the AMP pages, including on the link above:

<amp-img width="1024" height="683" src="data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" ...>

It looks like there may be image lazy-loading on the site that outputs a featured image in AMP that’s not visible.

• This reply was modified 8 years, 2 months ago by Ryan Kienstra.