The HTML block includes several useful advanced supports that expand its flexibility for custom implementations via the Greyd Plugin.
First, the block supports the HTML Anchor feature, allowing you to assign a unique ID to the block for anchor-based navigation or internal linking. This is especially helpful when combining custom code with jump links or triggers.
Additionally, the Additional CSS class(es) field is available, letting you assign custom class names to the block wrapper for styling or scripting purposes. This field is not enabled by default in WordPress for this block but is activated through Greyd.
Finally, the block also supports Inline CSS, allowing you to apply scoped styling directly to the block without needing to register external styles or selectors. This is ideal for quick layout fixes or visual tweaks applied to custom HTML output.
See the Advanced section documentation for more details.