public function addExtraOembedProviders( $providers ) {

		// Format (string), Provider (string), Is format a regular expression? (bool)
		$providers['#https?://mathembed\.com/latex\?inputText=.*#i'] = [ 'https://mathembed.com/oembed', true ];
		$providers['#https?://www\.openassessments\.org/assessments/.*#i'] = [ 'https://www.openassessments.org/oembed.json', true ];
		$providers['://cdn.knightlab.com/libs/timeline*'] = [ 'https://oembed.knightlab.com/timeline/', false ];
		$providers['://uploads.knightlab.com/storymapjs/*/index.html'] = [ 'https://oembed.knightlab.com/storymap/', false ];

		return $providers;
	}