The HTML <noscript> Element defines a section of html to be inserted if a script type on the page is unsupported or if scripting is currently turned off in the browser.

Element HTML HTML scripting Reference Web

The HTML Script Element (<script>) is used to embed or reference an executable script within an HTML or XHTML document.

Element HTML HTML scripting Reference Web

The HTML <canvas> Element can be used to draw graphics via scripting (usually JavaScript). For example, it can be used to draw graphs, make photo compositions or even perform animations. You may (and should) provide alternate content inside the <canvas> block. That content will be rendered both on older browsers that don't support canvas and in browsers with JavaScript disabled.

Canvas Element HTML HTML scripting HTML5 Reference Web