Neuroglancer Viewer has many accessibility issues

[jingdid]

Upon running an Axe Devtools scan of our neuroglancer page, we surfaced a very large number of accessibility issues that seem inbuilt to the Neuroglancer library.

For example, class .neuroglancer-side-panel-titlebar.neuroglancer-layer-side-panel-title gets assigned background-color: #393; while the text on it in .neuroglancer-layer-side-panel-name gets assigned color: white; and this is not a high enough contrast ratio, resulting in this message: Element has insufficient color contrast of 3.65 (foreground color: #ffffff, background color: #339933, font size: 9.0pt (12px), font weight: bold). Expected contrast ratio of 4.5:1

Most other issues surfaced were either due to "Form elements must have labels" or " elements with an img role must have an alternative text."

[jbms]

Potentially we could tweak the colors a bit. I would indeed consider issues like that in-scope. As far as I am aware Neuroglancer, being a visualization tool, is not usable anyway by users that rely on a screen reader, for example, and therefore accessibility issues related to screen reader usage are irrelevant.

[jingdid]

Tweaking the colors would be very helpful! Not catering to screen reader usage seems pretty reasonable.