Editor outputs non-standart `strike` element instead of `s`

[Danil]

Editor with default configuration produces <strike> element when you execute Strike command. Neither html4 nor html5 standarts has no strike element. The nearest element to strike is s element, defined by html5. See draft specification: ​http://www.w3.org/html/wg/drafts/html/master/text-level-semantics.html#the-s-element

[Piotrek Koszuliński]

Pull request: ​https://github.com/ckeditor/ckeditor-dev/pull/18

[Guillermo]

You might want to investigate and consider the <del> tag:

The <s> element is deprecated in HTML 4.01.
The <s> element is redefined in HTML 5.

The <del> tag is defined in both and was unchanged between HTML 4.01 and HTML 5.

[Danil]

Both tags works fine and looks the same. But the <del> has more specific meaning than <s>. Use custom buttons or styles for <del>. It would be great to have a plugin, providing ins/del buttons...

[Frederico Caldeira Knabben]

The <s> element seems to be much more appropriate for the current user people have for the "strike-through" button. ​As defined in HTML5 it has the purpose of "representing contents that are no longer accurate or no longer relevant".

Still this is relatively important change in the editor behavior, so I'm moving it to a major version.

[Piotrek Koszuliński]

Let's handle this issue after entire #9829 (with its subtickets). Thanks to automatic features' HTML forms unification we won't have any problem with backward compatibility.

[Olek Nowodziński]

Created branch ​t/9796@cksource that contains necessary changes.

[Olek Nowodziński]

Changed <strike> to <s> in ​git:db6ffc3a857. Updated samples.