Fix document format

import android.os.Handler;

/**

 * The Java representation of the

 * <p>The Java representation of the

 * <a href="https://html.spec.whatwg.org/multipage/comms.html#messageport">

 * HTML5 message ports.</a>

 * HTML5 message ports.</a> </p>

 *

 * A Message port represents one endpoint of a Message Channel. In Android

 * <p>A Message port represents one endpoint of a Message Channel. In Android

 * webview, there is no separate Message Channel object. When a message channel

 * is created, both ports are tangled to each other and started, and then

 * returned in a MessagePort array, see {@link WebView#createWebMessageChannel}

 * for creating a message channel.

 * for creating a message channel. </p>

 *

 * When a message port is first created or received via transfer, it does not

 * <p>When a message port is first created or received via transfer, it does not

 * have a WebMessageCallback to receive web messages. The messages are queued until

 * a WebMessageCallback is set.

 * a WebMessageCallback is set. </p>

 *

 * A message port should be closed when it is not used by the embedder application

 * <p>A message port should be closed when it is not used by the embedder application

 * anymore. A closed port cannot be transferred or cannot be reopened to send

 * messages. Close can be called multiple times.

 * messages. Close can be called multiple times. </p>

 *

 * When a port is transferred to JS, it cannot be used to send or receive messages

 * <p>When a port is transferred to JS, it cannot be used to send or receive messages

 * at the Java side anymore. Different from HTML5 Spec, a port cannot be transferred

 * if one of these has ever happened: i. a message callback was set, ii. a message was

 * posted on it. A transferred port cannot be closed by the application, since

 * the ownership is also transferred.

 * the ownership is also transferred. </p>

 *

 * It is possible to transfer both ports of a channel to JS, for example for

 * communication between subframes.

 * <p>It is possible to transfer both ports of a channel to JS, for example for

 * communication between subframes.</p>

 */

public abstract class WebMessagePort {