Insights: improvements to a11y of links This CL improves the a11y of links within the sidebar by turning them into buttons, which are focusable + fire the click on "enter" by default. It also fixes the interactivity with the toggle icon by: 1. Making the toggle icon inert, so it doesn't take user events or appear in the a11y tree (which is fine for us; any time the user clicks on it it fires a click on the header element which is where the toggle behaviour is). 2. Adds a keydown handler to allow Enter+Space to toggle the insight expansion state. 3. Makes each insight header keyboard focusable. Fixed: 372086700, 372092783, 372085384, 372084952 Change-Id: I0a7e58b57db0142b343412d2a74ba4862206f879 Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/5914255 Auto-Submit: Jack Franklin <jacktfranklin@chromium.org> Reviewed-by: Andres Olivares <andoli@chromium.org> Commit-Queue: Jack Franklin <jacktfranklin@chromium.org>
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