Comment's form displaying validation message on the same page instead of directing user to new page & displaying errors.

[AkSDvP]

On any Page/Post, while adding a comment if in case of validation error user is redirected to new page & error messages are displayed.
Instead, it would be more user-friendly if the user is not directed to new page & error messages are displayed on the page itself, probably before form title.

[AkSDvP]

Snapshot with Error Messages displayed on other page after form data is being validated.

[pento]

Thank you for the bug report, @AkSDvP!

comment_form() adds the required attribute to the <input> fields, so your browser should show a warning when they're not filled out.

Are you able to reproduce this lack of client-side warning on a site using a default theme, and no plugins?

[AkSDvP]

@pento Yes, I was able to reproduce the same issue by deactivating all plugins & using the twentynineteen theme.
Actually, I am testing this functionality on my local machine & it is the development environment. This issue was noticed in earlier versions as well.

For reference: I am testing it on Chrome Browser (Version 64.0.3282.140 (Official Build) (64-bit)) & Ubuntu OS.

[AkSDvP]

Snapshot to view default comments form for reference.

[SergeyBiryukov]

Previously: #4332

[SergeyBiryukov]

Hi @AkSDvP, welcome to WordPress Trac! Thanks for the ticket.

Replying to pento:

comment_form() adds the required attribute to the <input> fields, so your browser should show a warning when they're not filled out.

It does add the required attribute, however it also has the novalidate attribute on the form, which prevents client-side validation from being performed due to concerns about browsers implementing validation in very different ways, per discussion in #15080.

We're now re-evaluating that decision in #47595, let's continue the discussion there.