chore: add VNU checking

[nschonni]

From the README:

All HTML should validate in the NU HTML Validator. Exceptions to this rule are warnings and errors related to future ARIA features we need to implement.

Current errors are below, but may be related to current work

"file:examples/landmarks/at.html":93.18-93.119: error: Bad value “80%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
"file:examples/landmarks/at.html":126.20-126.121: error: Bad value “80%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
"file:examples/landmarks/at.html":187.16-187.115: error: Bad value “80%” for attribute “width” on element “img”: Expected a digit but saw “%” instead.
"file:examples/landmarks/at.html":97.13-97.44: error: The “aria-labelledby” attribute must point to an element in the same document.
"file:examples/listbox/listbox.html":65.13-65.117: error: Bad value “” for attribute “aria-activedescendant” on element “ul”: An ID must not be the empty string.
"file:examples/listbox/listbox.html":124.13-130.42: error: Bad value “” for attribute “aria-activedescendant” on element “ul”: An ID must not be the empty string.
"file:examples/menu-button/menu-button-links.html":59.15-59.30: error: Bad value “none” for attribute “role” on element “li”.
"file:examples/menu-button/menu-button-links.html":64.15-64.30: error: Bad value “none” for attribute “role” on element “li”.
"file:examples/menu-button/menu-button-links.html":69.15-69.30: error: Bad value “none” for attribute “role” on element “li”.
"file:examples/menu-button/menu-button-links.html":74.15-74.30: error: Bad value “none” for attribute “role” on element “li”.
"file:examples/menu-button/menu-button-links.html":79.15-79.30: error: Bad value “none” for attribute “role” on element “li”.
"file:examples/menu-button/menu-button-links.html":84.15-84.30: error: Bad value “none” for attribute “role” on element “li”.
"file:examples/toolbar/toolbar.html":41.13-41.95: error: Attribute “aria-selected” not allowed on element “div” at this point.

To ignore work in progress the --filterpattern option could be used till patches are landed in the validator.

/cc @sideshowbarker

[ZoeBijl]

@nschonni could you have a look at the error log? It tries to install an aria-practices 0.0.0 package :/.

[nschonni]

aria-practices@0.0.0 is this repo https://github.com/w3c/aria-practices/blob/master/package.json#L3

[nschonni]

Spun off some separate issues and PRs for the existing errors.

• Incorrect width value Landmark AT Example page using percentage based image widths #427
• Incorrect labelledby value chore: typo in "nvda" aria-labelledby value #428
• Empty aria-activedescendant Listbox example has hardcoded empty aria-activedescendant value #429

Not sure about the role=none ones. Maybe those should be filtered

[ZoeBijl]

@nschonni whoop whoop! I’ll have a look at the new issues. role=none is valid per aria 1.1 so that should def be filtered.

[nschonni]

Added a filter file, but I'm not sure about this one

aria-practices/examples/toolbar/toolbar.html":41.13-41.95: error: Attribute “aria-selected” not allowed on element “div” at this point.

[nschonni]

Rebased and opened a few new PRs to address newer markup issues

[mcking65]

After setting up a branch with these changes, I tried running npm test:

$ npm test

> aria-practices@0.0.0 test C:\Users\mck\git\APG\main
> npm run lint && npm run vnu-jar


> aria-practices@0.0.0 lint C:\Users\mck\git\APG\main
> eslint bin examples


> aria-practices@0.0.0 vnu-jar C:\Users\mck\git\APG\main
> java -jar node_modules/vnu-jar/build/dist/vnu.jar --errors-only --filterfile .vnurc --no-langdetect examples/**/*.html


mck@MCK--243 MINGW64 ~/git/APG/main (nschonni-vnu-jar)
$

Why isn't it spitting out the validation errors for me? I should find the errors with fixes proposed in PRs #537 and #538; I haven't yet merged those fixes.

BTW, after setting up this branch, I did update my NPM packages.

[nschonni]

Those fixes are independent markup errors.

Do you have Java available in that environment? Not sure if it would probably just throw a different error if you didn't.

[jnurthen]

Logged validator/validator#579 for the rowgroup in table issue

[jnurthen]

@nschonni Can you please add to the filter the following error:
An element with “role=rowgroup” must be contained in, or owned by, an element with “role=grid”.

[nschonni]

@jnurthen added the filter for the rowgroup

The last commit could be submitted separately, but I figured I'd include it to make the build green

[nschonni]

Although #429 is closed, I couldn't remove the suppression of Bad value “” for attribute “aria-activedescendant” on element “ul”: An ID must not be the empty string

"file:/Users/nschonni/Documents/github/aria-practices/examples/listbox/listbox-rearrangeable.html":69.13-69.117: error: Bad value “” for attribute “aria-activedescendant” on element “ul”: An ID must not be the empty string.
"file:/Users/nschonni/Documents/github/aria-practices/examples/listbox/listbox-rearrangeable.html":129.13-135.42: error: Bad value “” for attribute “aria-activedescendant” on element “ul”: An ID must not be the empty string.

[nschonni]

@mcking65 is there any other changes needed for this?

[nschonni]

Bumped and rebased since some of the ignored errors have been addressed in the validator

[nschonni]

Rebased to fix conflict

[jnurthen]

Thanks. Lets see how this goes!