dynamic type attribute for <input> element causes false positive autocomplete A11y warning

[eltigerchino]

Describe the bug

Using a dynamic type on an <input> element causes the false positive A11y warning when paired with the autocomplete="off" attribute. Similar report #8520 (comment)

Related to #8520

Reproduction

https://svelte.dev/repl/23816016ae244746962d5d674c0eedc7?version=3.59.0

Logs

A11y: The value 'off' is not supported by the attribute 'autocomplete' on element <input type="null"> (8:2)

System Info

System:
    OS: macOS 13.3.1
    CPU: (8) arm64 Apple M1 Pro
    Memory: 228.80 MB / 32.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.16.0 - ~/.nvm/versions/node/v18.16.0/bin/node
    npm: 9.5.1 - ~/.nvm/versions/node/v18.16.0/bin/npm
  Browsers:
    Chrome: 112.0.5615.137
    Chrome Canary: 115.0.5756.0
    Firefox: 112.0.2
    Firefox Developer Edition: 110.0
    Safari: 16.4
    Safari Technology Preview: 16.4
  npmPackages:
    svelte: ^3.59.0 => 3.59.0

Severity

annoyance

[WAKayser]

Alternatively I have the reverse behavior.

<input type="password" autocomplete={autocomplete ?? 'off'} />

gives me the following error:

A11y: The value 'null' is not supported by the attribute 'autocomplete' on element <input type="password">(a11y-autocomplete-valid)

Which happens for me after the upgrade to svelte 3.59.0