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HTML Iframes

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


CSS Selectors

CSS selectors are used to "find" (or select) the HTML elements you want to style.
We can divide CSS selectors into five categories:
Simple selectors (select elements based on name, id, class)
Combinator selectors (select elements based on a specific relationship between them)
Pseudo-class selectors (select elements based on a certain state)
Pseudo-elements selectors (select and style a part of an element)
Attribute selectors (select elements based on an attribute or attribute value) 01249751527


Navbar

Documentation and examples for Bootstrap’s powerful, responsive navigation header, the navbar. Includes support for branding, navigation, and more, including support for our collapse plugin.


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Screen readers

Use screen reader utilities to hide elements on all devices except screen readers.


Visibility

Control the visibility, without modifying the display, of elements with visibility utilities. 01249751527


Migrating to v4

Bootstrap 4 is a major rewrite of the entire project. The most notable changes are summarized below, followed by more specific changes to relevant components.


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Forms Examples and usage guidelines for form control styles, layout options, and custom components for creating a wide variety of forms.

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What is HTML Web Storage? With web storage, web applications can store data locally within the user browser.
Before HTML5, application data had to be stored in cookies, included in every server request. Web storage is more secure, and large amounts of data can be stored locally, without affecting website performance.
Unlike cookies, the storage limit is far larger (at least 5MB) and information is never transferred to the server.
Web storage is per origin (per domain and protocol). All pages, from one origin, can store and access the same data.

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CSS Selectors CSS selectors are used to "find" (or select) the HTML elements you want to style.
We can divide CSS selectors into five categories:
Simple selectors (select elements based on name, id, class)
Combinator selectors (select elements based on a specific relationship between them)
Pseudo-class selectors (select elements based on a certain state)
Pseudo-elements selectors (select and style a part of an element)
Attribute selectors (select elements based on an attribute or attribute value)

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Geolocation API The HTML Geolocation API is used to locate a user position.
Locate the User Position
The HTML Geolocation API is used to get the geographical position of a user.
Since this can compromise privacy, the position is not available unless the user approves it.

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Encoding (Character Sets) To display an HTML page correctly, a web browser must know which character set to use.
What is Character Encoding?
ASCII was the first character encoding standard (also called character set). ASCII defined 128 different alphanumeric characters that could be used on the internet: numbers (0-9), English letters (A-Z), and some special characters like ! $ + - ( ) @ .
ISO-8859-1 was the default character set for HTML 4. This character set supported 256 different character codes.
ANSI (Windows-1252) was the original Windows character set. ANSI is identical to ISO-8859-1, except that ANSI has 32 extra characters.
Because ANSI and ISO-8859-1 were so limited, HTML 4 also supported UTF-8.
UTF-8 (Unicode) covers almost all of the characters and symbols in the world.
The default character set for HTML5 is UTF-8.
The HTML charset Attribute
To display an HTML page correctly, a web browser must know the character set used in the page.

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Approach Learn about the guiding principles, strategies, and techniques used to build and maintain Bootstrap so you can more easily customize and extend it yourself.