The HTML API is almost three years old, but continues to evolve with each WordPress release. It’s seen deployment in WordPress’ backend, in Gutenberg, and in many plugins and themes. The HTML API’s core values have even expanded into new pipelines for working with block structure and text encodings, helping to modernise, optimise, and harden WordPress. This in-depth workshop will review recent updates, explore undocumented capabilities of these APIs, cast a vision for their ongoing development, provide hands-on experience working with and expanding them, and offer quality time for asking questions and interactively exploring the answers.