detectFullscreenMode ()  {
		const
			t = this,
			isNative = t.media.rendererName !== null && /(native|html5)/i.test(t.media.rendererName)
		;

		let mode = '';

		if (Features.HAS_TRUE_NATIVE_FULLSCREEN && isNative) {
			mode = 'native-native';
		} else if (Features.HAS_TRUE_NATIVE_FULLSCREEN && !isNative) {
			mode = 'plugin-native';
		} else if (t.usePluginFullScreen && Features.SUPPORT_POINTER_EVENTS) {
			mode = 'plugin-click';
		}

		t.fullscreenMode = mode;
		return mode;
	}
Detect the type of fullscreen based on browser's capabilities

@return {String}