html.elements.input.type_datetime-local - does not support seconds (step=1) on "Firefox for Android"

MDN URL

https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/input/datetime-local

What specific section or headline is this issue about?

Browser compatibility

What information was incorrect, unhelpful, or incomplete?

According to the documentation, inputs of type "datetime-local" also support seconds for the time by setting the "step" attribute to the value "1". Firefox for Android however does not support this. For some reason, the mobile version of Firefox does support seconds for inputs of type "time" but not for inputs of type "datetime-local", where the popup dialog will allow the user to select the hours and minutes, but not seconds. After selecting a vlaue, the input itself will display seconds too, but the popup widget doesn't seem to support seconds for some reason. This appears to be the case on all devices for many years now, so the browser compatibility table is incorrectly showing "Full support" for Firefox on Android. Other mobile browsers do seem to support a datetime picker with seconds.

What did you expect to see?

A note should be added to "Firefox for Android" that inputs of type "datetime-local" are not fully supported.

Do you have any supporting links, references, or citations?

There are some. However you can simply test it yourself by displaying

<input type="datetime-local" step="1"/>

in Firefox on an Android device.

Do you have anything more you want to share?

No response

MDN metadata

Start with the compatibility data for the datetime-local page at files/en-us/web/html/reference/elements/input/datetime-local/index.md and verify the reported behavior using in Firefox on Android. Compare the existing Firefox for Android entry with the observed seconds support, then confirm the compatibility data accurately records the result.