Syntax highlight is used colorize the source code based on each word's category. For example, keywords can be one color or type names and variables can use another font color. In Blazor previously I have shown how PrismJS can be used to highlight source code. Another approach is to use Monaco Editor. Monaco Editor is a code editor that powers VS Code. It has tremendous amount of features, way more than required for code highlighting. Using it for code highlight might sound controversial, but it is the same component as used by one of the most used code editors, so it looks and feels familiar.