[Webkit-unassigned] [Bug 75903] New: matchMedia() MediaQueryList not updating

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=75903

           Summary: matchMedia() MediaQueryList not updating
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: HTML DOM
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: webkit at nczonline.net


The implementation of matchMedia() is incomplete in two ways:

1) The returned MediaQueryList's matches property never changes. The matches property should return the correct value based on whether or not the media query matches. The WebKit version only initializes the matches property upon calling matchMedia().

2) The media query listeners are never fired. I suspect this is related to #1, since you're not tracking changes, the listeners are unable to fire when the query becomes valid for the page.

Simple test case:

var media = window.matchMedia("screen and (max-width:600px)");
console.log("Does it match now? " + media.matches);
media.addListener(function(media){
    console.log("HERE: " + window.innerWidth);
});

When resizing the window to less than 600px, you should see a console message appear. It does so in Firefox but not in Chrome or Safari


My UA string:
Mozilla/5.0 (Windows NT 5.1) AppleWebKit/535.11 (KHTML, like Gecko) Chrome/17.0.963.26 Safari/535.11

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