background-size - CSS | MDN

background-size - CSS | MDN.
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<blockquote class="wp-embedded-content" data-secret="Avw5QjSHWy"><a href="https://tenman.info/labo/css/?p=399">background-size - CSS | MDN</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://tenman.info/labo/css/?p=399&#038;embed=true#?secret=Avw5QjSHWy" width="600" height="400" title="&#8220;background-size - CSS | MDN&#8221; &#8212; CSS note" data-secret="Avw5QjSHWy" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script>
/**
 * WordPress inline HTML embed
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 * @since 4.4.0
 * @output wp-includes/js/wp-embed.js
 *
 * Single line comments should not be used since they will break
 * the script when inlined in get_post_embed_html(), specifically
 * when the comments are not stripped out due to SCRIPT_DEBUG
 * being turned on.
 */
(function ( window, document ) {
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	}

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	/* Abort if script was already executed. */
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		return;
	}

	/**
	 * Receive embed message.
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	 * @param {MessageEvent} e
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		/* Verify shape of message. */
		if (
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			allowedProtocols = new RegExp( '^https?:$', 'i' ),
			i, source, height, sourceURL, targetURL;

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			if ( e.source !== source.contentWindow ) {
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			source.removeAttribute( 'style' );

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				if ( height > 1000 ) {
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				} else if ( ~~height < 200 ) {
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				}

				source.height = height;
			} else if ( 'link' === data.message ) {
				/* Link to a specific URL on request. */
				sourceURL = new URL( source.getAttribute( 'src' ) );
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				if (
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	document.addEventListener( 'DOMContentLoaded', onLoad, false );
})( window, document );
</script>
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