via wptavern.com => original post link
Nick Diego, a developer advocate at Automattic and core contributor, is the author of the popular Icon Block plugin that enables users to add custom SVG icons and graphics to the WordPress block editor. He is often asked if the plugin can add icons to the core Button block, but that is outside the scope of what it does. Last week he wrote a plugin that fulfills this feature request in a separate plugin without building a custom block.
Everyone asks me if @theiconblock can add icons to the core Button block in #WordPress.
Unfortunately, the answer is no.