Shouldnt the expected markup be
<button type="button"
??

Also you say they were changed. If you can see when there should be an explanation with the pull request that made the change

Also you say they were changed. If you can see when there should be an explanation with the pull request that made the change

i should have said they were copy-pasted

and the

<input type="button"

was made:
<a class="btn" type="button"
or
<a type="button" class="btn"
or
similar

but the type="button" was forgotten and it was not removed ,

thus we get invalid HTML markup
and i asked the question if there is a reason it was removed in some cases and it was not removed in other cases

<button type="button" is unneeded a button has already a type button
So <a class="btn" type="button" probably should be <a class="btn" role="button"

<button type="button" is unneeded a button has already a type button

You would think so but the specification says otherwise
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button
https://www.w3.org/TR/2011/WD-html5-20110525/the-button-element.html#attr-button-type

@brianteeman

i think you meant to look here: at the A tag instead of the BUTTON tag
since the discussion about INPUT and BUTTON tags was done only to understand why the invalid tag parameter (type="button") was added at the A tag

correct link is this
https://developer.mozilla.org/en-US/docs/Web/HTML/Element/a

so @dgt41 is right about

So <a class="btn" type="button" probably should be <a class="btn" role="button"

in short the conclusion is that the type="button" should either be removed for links or be replaced with role="button"

no i meant exactly what I said.

@brianteeman from w3c:

type="button" does nothing, so it's useless. The only time that you need it is either for submit or reset.

Now for <a> tag for accessibility we need to specify that this element should be interpreted as button not as link, thus the role="button"

@dgt41 yes it does nothing but its still valid

@brianteeman, ok, you meant what you said, i see it now. But can we stick to the original issue, i tried to make all valid html pages on backend , and i am hitting on invalid link tags, do you agree that this should be fixed ? Lets forget of the button tag ?

since you edited the original issue i no longer know what it is

<a class="btn" type="button" should be <a class="btn" role="button"
I totally agree with @ggppdk here

since you edited the original issue i no longer know what it is

i did not edit description part speaking of the issue reported here
it remain exactly the same,

A tags (aka link tags) that have an invalid parameter
also original title spoke of invalid a tags that originated from input-type-button tags:

Invalid HTML for input-type-button that were converted to a-class-btn ??? to

So i will make a PR to change invalid A Tags

ok closed awaiting the pr