*ByRole form seems not to find <form /> elements

Nobody has claimed this yet.

Prior issue #1021

Testcase:

it(`testcase`, async () => {
    render(
        <div>
            <h1>helloworld</h1>
            <form>
                <h2>content</h2>
                <label htmlFor="tinput">hello</label>
                <input type="text" id="tinput" />
            </form>
        </div>
    )

    expect(screen.getByRole("form")).toBeInTheDocument()
})

Result:

 FAIL  src/test/foo.test.js
  ● testcase

    TestingLibraryElementError: Unable to find an accessible element with the role "form"

    Here are the accessible roles:

      heading:

      Name "helloworld":
      <h1 />

      Name "content":
      <h2 />

      --------------------------------------------------
      textbox:

      Name "hello":
      <input
        id="tinput"
        type="text"
      />

      --------------------------------------------------

    Ignored nodes: comments, script, style
    <body>
      <div>
        <div>
          <h1>
            helloworld
          </h1>
          <form>
            <h2>
              content
            </h2>
            <label
              for="tinput"
            >
              hello
            </label>
            <input
              id="tinput"
              type="text"
            />
          </form>
        </div>
      </div>
    </body>

      15 |   );
      16 |
    > 17 |   expect(screen.getByRole('form')).toBeInTheDocument();
         |                 ^
      18 | });
      19 |

      at Object.getElementError (node_modules/@testing-library/dom/dist/config.js:37:19)
      at node_modules/@testing-library/dom/dist/query-helpers.js:76:38
      at node_modules/@testing-library/dom/dist/query-helpers.js:52:17
      at node_modules/@testing-library/dom/dist/query-helpers.js:95:19
      at Object.getByRole (src/test/foo.test.js:17:17)

@testing-library/dom version: 9.3.4
Testing Framework and version: jest 29.7.0
DOM Environment: jsdom 20.0.0

In the previously mentioned bug, @eps1lon explained that this was following the roles from html-aam. However it looks like they've been updated, see https://www.w3.org/TR/core-aam-1.2/#role-map-form-nameless. It looks like that a form element without an accessible name gets a computed role form too.
However they mention that it shouldn't be exposed as a landmark. Is that where my interpretation is wrong?

Thanks for your feedback!

Start by reproducing the testcase in src/test/foo.test.js with @testing-library/dom 9.3.4, then compare the observed form role behavior with the linked Core-AAM form role mapping. Check the existing role-computation tests and add a regression case if the specification supports exposing a nameless form. Done means the behavior and test expectations agree with the applicable accessibility mapping.

Written by the indexing model from the issue text.

Description

Contributor guide

First steps

Research direction

Assessment