Accessibility/Planning/Tests

<div id="a1">111</div>
<div id="a2" aria-labelledby="b1">222</div>
<div id="a3" aria-labelledby="b2">333</div>

<div id="b1" style="display: none;">444</div>
<div id="b2" style="visibility: hidden">555</div>

A11y tree notes

• Three sections corresponding to a1, a2, a3
• b1, and b2 are not in the a11y tree
• a2 is named 444, and has no IA2 relation
• a3 is named 555, and has no IA2 relation