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Editing: responsive-embeds.js

/**
 * File responsive-embeds.js.
 *
 * Make embeds responsive so they don't overflow their container.
 */

/**
 * Add max-width & max-height to <iframe> elements, depending on their width & height props.
 *
 * @since Twenty Twenty-One 1.0
 *
 * @return {void}
 */
function twentytwentyoneResponsiveEmbeds() {
	var proportion, parentWidth;

// Loop iframe elements.
	document.querySelectorAll( 'iframe' ).forEach( function( iframe ) {
		// Only continue if the iframe has a width & height defined.
		if ( iframe.width && iframe.height ) {
			// Calculate the proportion/ratio based on the width & height.
			proportion = parseFloat( iframe.width ) / parseFloat( iframe.height );
			// Get the parent element's width.
			parentWidth = parseFloat( window.getComputedStyle( iframe.parentElement, null ).width.replace( 'px', '' ) );
			// Set the max-width & height.
			iframe.style.maxWidth = '100%';
			iframe.style.maxHeight = Math.round( parentWidth / proportion ).toString() + 'px';
		}
	} );
}

// Run on initial load.
twentytwentyoneResponsiveEmbeds();

// Run on resize.
window.onresize = twentytwentyoneResponsiveEmbeds;