The metadata will be displayed on the page, are used by browsers (how to display content or reload page), by search engines (keywords), and other web services

Defines a set of navigation links

Defines an independent, self-contained content

Defines a header for a document or a section

Defines a section in a document

Defines content aside from the content (like a sidebar)

Defines a footer for a document or a section

Defines additional details that the user can open and close on demand

Defines a heading for the <summary> element

Responsive web design is about creating web pages that look good on all devices!

A responsive web design will automatically adjust for different screen sizes and viewports

Responsive Web Design is about using HTML and CSS to automatically resize (hide, shrink, or enlarge, a website, to make it look good on all devices (desktops, tablets, and phones))

The text size can be set with a "vw" unit, which means the "viewport height"

The text size can be set with a "vw" unit, which means the "viewport width"

1vw = 1% of viewport height

The most common way to discover the type of a file, is to look at the file extension

Multimedia files have formats and different extensions like: .wav, .mp3, .mp4, .mpg, .wmv, and .avi

Only MP4, WebM, and Ogg audio are supported by the HTML standard

Only MP3, WAV, and Ogg video are supported by the HTML standard

The controls attribute adds video controls, like play, pause, and volume

The <source> element allows you to specify alternative video files which the browser may choose from. The browser will use the first recognized format.