private function modify_dom_links( $dom ) {

		// Get all <links>.
		$links      = $dom->getElementsByTagName( 'link' );
		$to_replace = array();

		// Inline stylesheets.
		foreach ( $links as $link ) {

			// Only proceed for stylesheets.
			if ( 'stylesheet' !== $link->getAttribute( 'rel' ) ) {
				continue;
			}

			$raw = $this->get_stylesheet_raw( $link->getAttribute( 'href' ) );

			if ( empty( $raw ) ) {
				continue;
			}

			// Add it to be inlined late.
			$tag          = $dom->createElement( 'style', $raw );
			$to_replace[] = array(
				'old' => $link,
				'new' => $tag,
			);

		}

		// Do replacements, ensures cascade order is retained.
		foreach ( $to_replace as $replacement ) {
			$replacement['old']->parentNode->replaceChild( $replacement['new'], $replacement['old'] );
		}

		// Remove all remaining non stylesheet <links>.
		$links = $dom->getElementsByTagName( 'link' );
		while ( $links && $links->length ) {
			$links->item( 0 )->parentNode->removeChild( $links->item( 0 ) );
		}

	}