Android 2.x does not animate css with position fixed?

dabblet.css

/**
 * Android 2.x does not animate css with position fixed?
 */

.a
{
	border : #6f6 solid;
}

.b
{
	border : #f66 solid;
	right : 0;
	position : fixed;
}

.a,
.b
{
	transform : rotate(90deg);
	animation : spin 4s infinite;

	font : 4em/2em sans;
	text-align : center;
	width  : 2em;
	height : 2em;
}

@keyframes spin
{
    0%   { transform : rotate(0deg); }
    100% { transform : rotate(360deg); }
}

dabblet.html

<div class="a">A</div>
<div class="b">B</div>

settings.json

{"view":"split-vertical","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}