In PHPEd we have CSE Validator Lite 14.
There is a better Lite Validator now.
Can it be upgraded at CSE Validator Lite 17 ?
That will solve a lot of annoying warning errors in editor.

Let's ask Albert

You should be able to upgrade it to CSS HTML Validator Lite v16.05 which is the latest release of the lite edition (although it is a few years old because it has been discontinued):
https :// www . freehtmlvalidator . com /

The above link may not display. Try freehtmlvalidator dot com for the lite edition.

You should also be able to upgrade to the current version of CSS HTML Validator 2019 as well. If you're a NuSphere customer then contact me for a discount.

I hope this helps!

@dmitri
You should be able to upgrade it to CSS HTML Validator Lite v16.05 which is the latest release of the lite edition (although it is a few years old because it has been discontinued):
https :// www . freehtmlvalidator . com /

I like the Lite v16.05 since it is flexible and easy to use.