Addon-a11y: Fix type of context passed to axe.run

[kaelig]

What I did

According to axe's API reference, the context passed to axe.run can be a NodeList, but the addon-a11y is passing an HTMLCollection.

This PR ensures we're passing a NodeList and shouldn't impact functionality.

Related: dequelabs/axe-core#3161

How to test

• Is this testable with Jest or Chromatic screenshots?
• Does this need a new example in the kitchen sink apps?
• Does this need an update to the documentation?

If your answer is yes to any of these, please make sure to include it in your PR.

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[shilman]

cc @MichaelArestad

[kaelig]

By the way, what's this code supposed to do?

storybook/addons/a11y/src/a11yRunner.ts

Line 20 in 4750c6b

const storyRoot = document.getElementById('story-root');

Is #story-root a thing?

If this is only related to this addon, should it be documented?

[kylegach]

By the way, what's this code supposed to do?

storybook/addons/a11y/src/a11yRunner.ts

Line 20 in 4750c6b

const storyRoot = document.getElementById('story-root');

Is #story-root a thing?

Not that I could find: https://github.com/storybookjs/storybook/search?q=story-root 🤷‍♂️

[kylegach]

This change LGTM, though we may wish to simplify what may be un-needed code in a later effort (see: #16129 (comment)).

Thanks, @kaelig!

[shilman]

I filed a follow-up issue to remove #story-root, since we couldn't figure out what that is or what it's supposed to do. Merging this now! Thanks @kaelig !!! 🙏