 
     var url: NSURL? {
         didSet {
+            let wasHidden = lockImageView.hidden
             lockImageView.hidden = url?.scheme != "https"
+            if wasHidden != lockImageView.hidden {
+                UIAccessibilityPostNotification(UIAccessibilityLayoutChangedNotification, nil)
+            }
             updateTextWithURL()
             setNeedsUpdateConstraints()
         }

        }
        set (newReaderModeState) {
            if newReaderModeState != self.readerModeButton.readerModeState {
                self.readerModeButton.readerModeState = newReaderModeState
                readerModeButton.hidden = (newReaderModeState == ReaderModeState.Unavailable)
                UIView.animateWithDuration(0.1, animations: { () -> Void in
                    if newReaderModeState == ReaderModeState.Unavailable {
                        self.readerModeButton.alpha = 0.0

            make.trailing.centerY.equalTo(self)
            make.width.equalTo(self.readerModeButton.intrinsicContentSize().width + CGFloat(BrowserLocationViewUX.LocationContentInset * 2))
        }
    }

    override var accessibilityElements: [AnyObject]! {
        get {
            return [lockImageView, urlTextField, readerModeButton].filter { !$0.hidden }
        }
        set {
            super.accessibilityElements = newValue
        }
    }

    required init(coder aDecoder: NSCoder) {
