Press tab to select the slider, use the right and left arrow keys to move.
<div class="a11y-pdom-root">
<p data-focusable="false" class="a11y-pdom-element" data-unique-id="2-15" id="display1-primary-2-15" style="top: 0px; left: 0px; width: 1px; height: 1px;">
a hexagon of color
</p>
<button data-focusable="true" class="a11y-pdom-element" data-unique-id="2-16" id="display1-primary-2-16" style="top: 0px; left: 0px; width: 1px; height: 1px;">
Slider thumb at position 0
</button>
</div>