Not supported by Notepad++.
The TextFX plugin has an Insert Ruler function. However, it inserts a ruler as text in your file.

Hello Claudia,

Thank you for looking into it and for the detailed explanation. I appreciate it.

Good night. :)

Select Style Configurator... in the Settings menu, select e.g. HTML in the Language list, the Style list will show the descriptions of the items that are colored. Select one of these descriptions to show the specific color and font style for that item.

Notepad++ does not indicate errors in source code natively.
Maybe there’s a dedicated plugin with this functionality but I don’t know of any.
You could Google for a HTML and CSS Validator.

Convenient? Maybe.
Wise? Probably not. When any change to a third-party library gets automatically integrated into the this project, the project also automatically inherits the libraries (new/unknown) issues e.g. none backwards compatible changes in its interface.
IMO a controlled/managed update of third-party libraries/tools with regression tests/checks is preferred.

@Semigradsky

as I don’t have any sound I assume this is using the windows sounds.
Depending on your windows version open control panel goto sounds
and choose “no sounds” theme or so. Can’t remember how it is called correctly.

Cheers
Claudia

@Thomas-Koch

so let me try to summarize.
You ALWAYS have random text and random words which you wanna color different, correct?
If so, no, npp doesn’t have such functionality natively, because it is mainly an programmer editor
and as such, it colors, depending on the language, always the same words.
Plugins like Python Script, Lua Script, nppexec etc… can provide another way
solving your issue but therefore we would need more DETAILS what exactly
needs to be done.

If you are looking for a way to always color the same words, then you can easily define
a user defined language and put your words into one of the keyword field.
Choose a color and set your newly defined language via the language menu.
Done.

Cheers
Claudia