How to use hyperlink in ion slide box

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Hi everyone!
I have make hyperlink in ion-slide content, but i can’t click it.
Example:

<ion-slide-box on-slide-changed="slideHasChanged($index)">
      <ion-slide>
        <div class="box blue"><h1><a href="http://www.google.com">BLUE</a></h1></div>
      </ion-slide>
      <ion-slide>
        <div class="box yellow"><h1><a href="http://www.google.com">YELLOW</a></h1></div>
      </ion-slide>
      <ion-slide>
        <div class="box pink"><h1><a href="http://www.google.com">PINK</a></h1></div>
      </ion-slide>
    </ion-slide-box>

Please help me!
Thanks!