<https://bg.khanacademy.org/computing/computer-programming/html-css-js>
<http://schema.org/name>
"HTML/JS: Създаване на интерактивни уеб страници"
<https://bg.khanacademy.org/computing/computer-programming/html-css-js/html-js-dom-animation/pt/animating-dom-with-setinterval>