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package elemental.html;
import  elemental.html.*;
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A MediaQueryList object maintains a list of media queries on a document , and handles sending notifications to listeners when the media queries on the document change.

This makes it possible to observe a document to detect when its media queries change, instead of polling the values periodically, if you need to programmatically detect changes to the values of media queries on a document.

public interface MediaQueryList {

true if the document currently matches the media query list; otherwise false. Read only.
  boolean isMatches();

The serialized media query list.
  String getMedia();


Adds a new listener to the media query list. If the specified listener is already in the list, this method has no effect.

The MediaQueryListListener to invoke when the media query's evaluated result changes.
  void addListener(MediaQueryListListener listener);


Removes a listener from the media query list. Does nothing if the specified listener isn't already in the list.

The MediaQueryListListener to stop calling on changes to the media query's evaluated result.
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