<h1> through <h6>The <h1> through <h6> HTML elements represent six levels of section headings, in order of decreasing importance.html-elementsHTML elementswidely2015-07-292018-01-29https://html.spec.whatwg.org/multipage/sections.html#the-h1,-h2,-h3,-h4,-h5,-and-h6-elementshttps://developer.mozilla.org/docs/Web/API/HTMLHeadingElementapi.HTMLHeadingElementhtml.elements.h1html.elements.h2html.elements.h3html.elements.h4html.elements.h5html.elements.h6https://nowyoucanuse.com/features--headings.html