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This improves a lot of accessibility shortcomings. Every possible instance of `<div class="button">` matching the command `ag '<[^ab].*?class=.*?[" ]button[ "]' templates/ | grep -v 'dropdown'` has been converted when possible. divs with the `dropdown` class and their children were omitted as 1. more analysis must be conducted whether the dropdowns still work as intended when they are a `button` instead of a `div`. 2. most dropdowns have `div`s as children. The HTML standard disallows `div`s inside `button`s. 3. When a dropdown child that's part of the displayed text content is converted to a `button`, the dropdown can be focused twice Further changes include that all "gitea-managed" buttons with JS code received an `e.preventDefault()` so that they don't accidentally submit an underlying form, which would execute instead of cancel the action. Lastly, some minor issues were fixed as well during the refactoring. ## Future improvements As mentioned in https://github.com/go-gitea/gitea/pull/23337#discussion_r1127277391, `<a>`s without `href` attribute are not focusable. They should later on be converted to `<button>`s. --------- Co-authored-by: wxiaoguang <wxiaoguang@gmail.com> Co-authored-by: silverwind <me@silverwind.io> Co-authored-by: techknowlogick <techknowlogick@gitea.io> Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
