How to add HTML Editor to Eclipse?

Alternatively, you can just install the "HTML Editor" from the WST package (the same one provided in Java EE Edition) in Eclipse 4.x, just by looking for "HTML Editor" in the marketplace (but, indeed, i haven't been able to found it in the "install new software").

On my side i prefer to work on Eclipse "Java Edition" most of the time (just adding the few additionnal features i really need).

Go to Install New Softwares-> Select your version eclipse repo. eg Mars - http://download.eclipse.org/releases/mars -> Expand Web,XML, JAVA EE option -> Install Eclipse Web Developer Tools