Bootstrap 4 Default Settings
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).
<h1> - <h6>
Bootstrap 4 styles HTML headings (<h1> to <h6>)  with a bolder font-weight and an increased font-size.
Display Headings
Display headings are used to stand out more than normal headings (larger font-size and lighter font-weight), and there are four classes to choose from: .display-1, .display-2, .display-3, .display-4
<small>
In Bootstrap 4 the HTML <small> element is used to create a lighter, secondary text in any heading
<mark>
Bootstrap 4 will style the HTML <mark> element with a yellow background color and some padding
<abbr>
Bootstrap 4 will style the HTML <abbr> element with a dotted border bottom
<blockquote>
Add the .blockquote class to a <blockquote> when quoting blocks of content from another source
<dl>
Bootstrap 4 will style the HTML <dl> element in the following way
<code>
Bootstrap 4 will style the HTML <code> element in the following way
<kbd>
Bootstrap 4 will style the HTML <kbd> element in the following way
<kbd>
Bootstrap 4 will style the HTML <kbd> element in the following way

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