(eng.
semantics) When you open html element and close it with
different tag. Etc. <h5></h4>
Also using div element too much will make for a good semantika on your website.
Code editor might
underline your semantika but just ignore it or turn off this "feature"
P1: Kamo to čo tam použivaš section, aside, header, footer elementy som to v živote nevidel. (Dude why u are using section aside header footer
elements I have never seen them)
P2: Hej no to je na kokot semantika, prepiš to na div. (You right, that semantika is
fucked up, just replace it with div)