Esp32 graphics on html

I want to make a graph that advances every second without using any loading (SPIFFS) or sensors but keeps its constant value but I don't have enough html knowledge.

https://en.wikipedia.org/wiki/Meta_refresh

salca1

I want to make a graph as given above. but with "same value" and recording seconds per second.
given above in the form of hours and the graph is stationary.