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Improve frontend guidelines (#23007)

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33
web_src/js/features/aria.md
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@ -1,8 +1,35 @@
**This document is used as aria/a11y reference for future developers**
# Checkbox
## Accessibility-friendly Checkbox
The ideal checkboxes should be:
```html
<label><input type="checkbox"> ... </label>
```
However, related styles aren't supported (not implemented) yet, so at the moment, almost all the checkboxes are still using Fomantic UI checkbox.
## Fomantic UI Checkbox
```html
<div class="ui checkbox">
<input type="checkbox"> <!-- class "hidden" will be added by $.checkbox() -->
<label>...</label>
</div>
```
Then the JS `$.checkbox()` should be called to make it work with keyboard and label-clicking, then it works like the ideal checkboxes.
There is still a problem: Fomantic UI checkbox is not friendly to screen readers, so we add IDs to all the Fomantic UI checkboxes automatically by JS.
# Dropdown
## ARIA Dropdown
There are different solutions:
There are different solutions:
* combobox + listbox + option
* menu + menuitem
@ -27,7 +54,7 @@ At the moment, `menu + menuitem` seems to work better with Fomantic UI Dropdown,
<div class="ui dropdown"> <!-- focused here, then it's not perfect to use aria-activedescendant to point to the menu item -->
<input type="hidden" ...>
<div class="text">Default</div>
<div class="menu transition hidden" tabindex="-1">
<div class="menu" tabindex="-1"> <!-- "transition hidden|visible" classes will be added by $.dropdown() and when the dropdown is working -->
<div class="item active selected">Default</div>
<div class="item">...</div>
</div>
@ -38,7 +65,7 @@ At the moment, `menu + menuitem` seems to work better with Fomantic UI Dropdown,
<input type="hidden" ...>
<input class="search" autocomplete="off" tabindex="0"> <!-- focused here -->
<div class="text"></div>
<div class="menu transition visible" tabindex="-1">
<div class="menu" tabindex="-1"> <!-- "transition hidden|visible" classes will be added by $.dropdown() and when the dropdown is working -->
<div class="item selected">...</div>
<div class="item">...</div>
</div>