I see mentions from years and years ago online about HTML Includes but this very simple common-sensical functionality doesn’t work for me at all. Has it been deprecated? 'Cause asking Google with those terms, “HTML Includes Deprecated?,” hasn’t dredged up anything on the first SERP for me yet.
If it has indeed been deprecated, does anyone know why? It’s so useful and simple I can’t imagine why anyone would want to not support it any longer.