I've seen several HTML-based Ordinals that use an API to re…

I've seen several HTML-based Ordinals that use an API to read the current block number on the network. Perhaps it's possible to code something in HTML that would "unlock" and display the content of a 3D model referenced by the code. This is different from Bitcoin's time lock function; it's a different approach.
Example: https://3dordi.io/ordinal/5f09db781e7453aa5999165b4308603b9fb9b45be6b5b0dfc15d603271695adf_0
There is also a timer in this kind of Ordinal that Zoide activates or deactivates at will, but I don't know how he does it.
https://3dordi.io/ordinal/1592db6838b9553b8bcf07995f48e4b99bb434224c940c3ef5317f7ed85d31d9_0