<!DOCTYPE HTML>
<style>
#outline {
    outline: 1px solid green;
}
</style>
This test passes if it does not crash and there is a green outline around the b.<br>
<svg width="300" height="300">
    <text y="30" x="30">
        <!-- The two spaces below create two boxes. -->
        a<tspan id="outline">  b</tspan>
    </text>
</svg>