Finally out of beta, this Rich Text editor supports unusual features such as interlinear text, and is a Universal App.
TextEdit
Is it worth entering author name, title, keywords and so on in a document’s Properties?
It may seem minor, but what TextEdit has been doing for the last 6 months is a travesty of what made the Mac.
TextEdit will happily trash an HTML file when you convert it to text – without any good reason, other than an engineer not being familiar with macOS.
A proposal for ensuring consistent display of Rich Text across apps and tools in macOS, and elsewhere.
Mojave’s handling of Rich Text in Dark Mode is now broken in several places, including the new version of TextEdit, in QuickLook, and Pages.
Not as large as the previous update to Mojave, it still replaces a lot of apps but Apple documents almost no changes. Here’s a summary of the detail.
Not mentioned in the release notes, the new version of TextEdit is a bold attempt to provide a Dark Mode which is infuriating, confusing, and inconsistent. Avoid it.
Now lets you set your own default font and size applied to all new windows, and offers better reduced contrast appearance in both Dark and Light modes.
How to extend TextEdit to create bi-modal text, and add more styles to DelightEd, TextEdit, and other apps. And how to use Font Traits.
The Eclectic Light Company 