ESP8266 Community Forum

It's probably a case of not seeing the wood for the trees, but I can't find anything about htmlvar() function in the docs other than it being mentioned in the returngui entry.

It's part of wprint:
WPRINT with htmlvar() function:

To place a dynamic variable that will update on each refresh of the page with the current contents of that variable use the htmlvar function.

Each time browser is refreshed the latest contents of the variable are place in the page.

wprint htmlvar({var name})

Thanks.
I suppose it doesn't have it's own entry because it was probably originally part of the 'html' command equivalent before that became depreciated in preference to wprint.