WP_Widget_Media_Video::inject_video_max_width_style( string $html )

Inject max-width and remove height for videos too constrained to fit inside sidebars on frontend.

Parameters

$html

(string) (Required) Video shortcode HTML output.

Return

(string) HTML Output.

Source

File: wp-includes/widgets/class-wp-widget-media-video.php 

	public function inject_video_max_width_style( $html ) {
		$html = preg_replace( '/\sheight="\d+"/', '', $html );
		$html = preg_replace( '/\swidth="\d+"/', '', $html );
		$html = preg_replace( '/(?<=width:)\s*\d+px(?=;?)/', '100%', $html );
		return $html;
	}

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Version Description
WP-4.8.0 Introduced.