Android browser - remove outline border when anchor is focused

Question

I am using on my Android app a webview which loades an external page. It has a few anchors (<a> tags). When I press on it, yellow border appears.

How can I prevent it and remove this border ?

I've tried following tricks:

// jQuery
$("a").focus(function(){
    $(this).attr("hideFocus", "hideFocus");
});

// CSS
a, :focus {
    outline: none;
}

but with no success.

Thanks !