is there a way to change the headers from H6 to H1 w/Jquery?

is there a way to change the headers from H6 to H1 w/Jquery?

Hi,

I have been trying to improve the SEO on one of my sites, somebody has told me that there's a way to change the code without hard coding, but using a Jquery script...is this true? i'd like to make some H6 becoming H1 basically

can you tell me more??

cheers!