.amp-wp-unknown-size [src] {
	/** Worst case scenario when we can't figure out dimensions for an image. **/
	/** Force the image into a box of fixed dimensions and use object-fit to scale. **/
	object-fit: contain;
}

amp-fit-text blockquote,
amp-fit-text h1,
amp-fit-text h2,
amp-fit-text h3,
amp-fit-text h4,
amp-fit-text h5,
amp-fit-text h6 {
	font-size: inherit;
}

/**
 * Override a style rule in Twenty Sixteen and Twenty Seventeen.
 * It set display:none for audio elements.
 * This selector is the same, though it uses amp-audio instead of audio.
 */
body amp-audio:not([controls]) {
	display: inline-block;
	height: auto;
}

.amp-wp-unknown-size [src] {
	/** Worst case scenario when we can't figure out dimensions for an image. **/
	/** Force the image into a box of fixed dimensions and use object-fit to scale. **/
	object-fit: contain;
}

amp-fit-text blockquote,
amp-fit-text h1,
amp-fit-text h2,
amp-fit-text h3,
amp-fit-text h4,
amp-fit-text h5,
amp-fit-text h6 {
	font-size: inherit;
}

/**
 * Override a style rule in Twenty Sixteen and Twenty Seventeen.
 * It set display:none for audio elements.
 * This selector is the same, though it adds body and uses amp-audio instead of audio.
 */
body amp-audio:not([controls]) {
	display: inline-block;
	height: auto;
}

Update comment to account for new body element.
Update comment to account for new body element.
