I’m interested in viewport units - as we know, vh and vw are hundredths of the viewport height and weight. The question is - could the total sum of all vh or vw values, on a specific page, be more than 100? Is it semantically acceptable?

I know it works, but logically, if 1 vw/1vh is equivalent to 1%, then the total sum of them should be max. 100%. Am I right?

That’s right. Most web pages have height much above browser window height. In such cases a scrollbar shows up and saves the day. Completely normal situation.