You can then use this SolidTextBlock in your XAML:

Windows Presentation Foundation (WPF) is Microsoft’s modern framework for building rich desktop client applications on Windows. An offshoot technology, code-named “WPF/E” (Windows Presentation Foundation/Everywhere), later became Silverlight. In some historical contexts, “WPFE” (Windows Presentation Foundation Extensible) refers to WPF’s extensibility model. This paper clarifies the terminology, explains the architecture of WPF, and highlights its extensibility features that gave rise to the WPFE concept.

Here is a simple example of creating a custom control that renders solid text:

Furthermore, WPFE code tends to be lightweight. Unlike some drag-and-drop builders that bloat the database with excessive shortcode metadata, front-end editors often save directly to the standard wp_posts table. This means the site remains SEO-friendly and lightweight, preserving the speed advantages of the theme.