W3C error: Element input is missing required attribute aria-expanded.

[ghost]

W3C error on fresh Magento 2 installation :

<input id="search"↩ data-mage-init='{"quickSearch":{↩ "formSelector":"#search_mini_form",↩ "url":"http://yourwebsite.com/search/ajax/suggest/",↩ "destinationSelector":"#search_autocomplete"}↩ }'↩ type="text"↩ name="q"↩ value=""↩ placeholder="Search entire store here..."↩ class="input-text"↩ maxlength="128"↩

Attributes for element input:
Global attributes
accept when type is file
alt when type is image
autocomplete when type is text, search, url, tel, e-mail, password, datetime, date, month, week, time, datetime-local, number, range, or color
autofocus
checked when type is checkbox or radio
dirname when type is text or search
disabled
form
formaction when type is submit or image
formenctype when type is submit or image
formmethod when type is submit or image
formnovalidate when type is submit or image
formtarget when type is submit or image
height when type is image
list when type is text, search, url, tel, e-mail, datetime, date, month, week, time, datetime-local, number, range, or color
max when type is datetime, date, month, week, time, datetime-local, number, or range
maxlength when type is text, search, url, tel, e-mail, or password
min when type is datetime, date, month, week, time, datetime-local, number, or range
multiple when type is email or file
name
pattern when type is text, search, url, tel, e-mail, or password
placeholder when type is text, search, url, tel, e-mail, password, or number
readonly when type is text, search, url, tel, e-mail, password, datetime, date, month, week, time, datetime-local, or number
required when type is text, search, url, tel, e-mail, password, datetime, date, month, week, time, datetime-local, number, checkbox, radio, or file
size when type is text, search, url, tel, e-mail, or password
src when type is image
step when type is datetime, date, month, week, time, datetime-local, number, or range
type
value when type is not file or image
width when type is image

W3C not compliant.

[odubovyk]

Thank you for reporting this issue! Internal ticket MAGETWO-50628

[vil11]

FYI: https://github.com/magento/magento2/wiki/Issue-reporting-guidelines

Dmytro Vilchynskyi, M2 QA.

[MomotenkoNatalia]

Internal ticket MAGETWO-50628 is closed and delivered to mainline. Please let us know if you still have an issue.

[odubovyk]

Ghost, please note that the attribute is added via JS and original source never changes. Only the DOM changes by JS.
You can see an HTML visualization of DOM changes using your browser's developer tools.

[ooples]

I'm getting this error and I'm using magento 2.1.6