Hue is a degree on the color wheel from 0 to 180

Saturation is a percentage value, 0% means a shade of gray, and 100% is the full color

Lightness is also a percentage value, 0% is black, and 100% is white

An HTML iframe is used to display a web page within a web page

An iframe can’t be used as the target frame for a link.

The target attribute of the link must refer to the name attribute of the iframe

The HTML … element is a container for the following elements: <title>, <style>, <meta>, <link>, <script>, <base>

… element is a container for metadata

metadata are called (data about data)

HTML metadata is data about the HTML document

Metadata is displayed

Metadata typically define the document title, character set, styles, scripts, and other meta information

<meta> element is typically used to specify the character set, page description, keywords, author of the document, and viewport settings

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