TEMPL_SYNTAX_BASELINE

ghtmx is a hard fork of templ. Per FR-004, the .ghtmx language surface is a syntactic superset of the templ syntax at the pinned baseline below, with two documented semantic carve-outs.

Carve-outs (FR-004)

Constructs valid at the baseline that ghtmx deliberately reinterprets:

1. hx-* attributes are typed bindings. The five verb attributes (hx-get, hx-post, hx-put, hx-patch, hx-delete) accept a Go handler symbol or a generated route constructor call, not an arbitrary string or expression. Arbitrary values produce GHTMX-E0601/GHTMX-E0602 diagnostics naming the replacement construct. Other hx-* attributes are validated against the pinned htmx version's attribute surface.
2. URL-context escaping at route-binding sites is engine-determined. The escaping context is derived from the attribute's declared type and is not author-selectable at the binding site.

The conformance corpus (ported from the baseline's parser, formatter, and generator test suites) is the executable form of this guarantee: every non-excluded case must parse and render equivalently. The corpus inventory and the itemized exclusion list live in CONFORMANCE.md.