HTML comments are not displayed in the browser, but they can help document your HTML source code.
Some characters are reserved in HTML.
If you use the less than or greater than signs in your text, the browser might mix them with tags.
Character entities are used to display reserved characters in HTML.
A character entity looks like this: 0501520846
A grid container contains grid items.
By default, a container has one grid item for each column, in each row, but you can style the grid items so that they will span multiple columns and or rows.
Bootstrap 4 uses a default font-size of 16px, and its line-height is 1.5.
The default font-family is "Helvetica Neue", Helvetica, Arial, sans-serif.
In addition, all p elements have margin-top: 0 and margin-bottom: 1rem (16px by default).
Provide contextual feedback messages for typical user actions with the handful of available and flexible alert messages. 0501520846
Popovers Documentation and examples for adding Bootstrap popovers, like those found in iOS, to any element on your site.
Bookmarks with ID and Links HTML bookmarks are used to allow readers to jump to specific parts of a Web page.
Bookmarks can be useful if your webpage is very long.
To make a bookmark, you must first create the bookmark, and then add a link to it.
When the link is clicked, the page will scroll to the location with the bookmark.
Uniform Resource Locators A URL is another word for a web address.
A URL can be composed of words (w3schools.com), or an Internet Protocol (IP) address (188.8.131.52).
Most people enter the name when surfing, because names are easier to remember than numbers.
URL - Uniform Resource Locator
Web browsers request pages from web servers by using a URL.
A Uniform Resource Locator (URL) is used to address a document (or other data) on the web.
HTML Audio The controls attribute adds audio controls, like play, pause, and volume.
The source element allows you to specify alternative audio files which the browser may choose from. The browser will use the first recognized format.
The text between the audio tags will only be displayed in browsers that do not support the audio element.
Scrollspy Automatically update Bootstrap navigation or list group components based on scroll position to indicate which link is currently active in the viewport.
Navs Navigation available in Bootstrap share general markup and styles, from the base .nav class to the active and disabled states.
Swap modifier classes to switch between each style.
The base .nav component is built with flexbox and provide a strong foundation for building all types of navigation components. It includes some style overrides (for working with lists), some link padding for larger hit areas, and basic disabled styling.