Class name of the widget title is incorrect

[youthkee]

There is an incorrect class name of the widget title at
/wp-includes/widgets.php line 250

'before_title' => '<h2 class="widgettitle">',

I think this should be as below to be applied default CSS styles.

'before_title' => '<h2 class="widget-title">',

It can be checked as accessing 404.php by some themes such as “Underscores”.

[westonruter]

Thanks for the report! However, this cannot be changed due because of backwards compatibility for any themes that may have CSS that is targeting .widgettitle. A theme needs to opt-in to widget-title when it calls register_sidebar(). Thanks!

[ocean90]

#39408 was marked as a duplicate.

[SergeyBiryukov]

#41818 was marked as a duplicate.