Don't confuse <b> element with <strong>, <em> or <mark>

'Do not confuse the <b> element with the <strong> , <em> , or <mark> elements', says MDN page on <b> : https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/b . But why, exactly? What kinds of daemons will we summon otherwise? Well, don't do it because 'the <strong> element represents text of certain importance, <em> puts some emphasis on the text and the <mark> element represents…