HTML Symbol Entities
HTML entities were described in the previous chapter.
Many mathematical, technical, and currency symbols, are not present on a normal keyboard.
To add such symbols to an HTML page, you can use an HTML entity name.
If no entity name exists, you can use an entity number, a decimal, or hexadecimal reference.
What is Multimedia?
Multimedia comes in many different formats. It can be almost anything you can hear or see,
like images, music, sound, videos, records, films, animations, and more.
Web pages often contain multimedia elements of different types and formats.
The first web browsers had support for text only, limited to a single font in a single color.
Later came browsers with support for colors, fonts, images, and multimedia!
Multimedia elements (like audio or video) are stored in media files.
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.
Common Video Formats
Videoformats There are many video formats out there.
The MP4, WebM, and Ogg formats are supported by HTML.
The MP4 format is recommended by YouTube. 0472283952
How it Works
The controls attribute adds video controls, like play, pause, and volume.
It is a good idea to always include width and height attributes. If height and width are not set, the page might flicker while the video loads.
The source element allows you to specify alternative video files which the browser may choose from. The browser will use the first recognized format.
The text between the video tags will only be displayed in browsers that do not support the video element.
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.
Examples and usage guidelines for form control styles, layout options, and custom components for creating a wide variety of forms. 0472283952
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.
Toasts Push notifications to your visitors with a toast, a lightweight and easily customizable alert message.
Composition vs Inheritance React has a powerful composition model, and we recommend using composition instead of inheritance to reuse code between components.
In this section, we will consider a few problems where developers new to React often reach for inheritance, and show how we can solve them with composition.
Dropdowns Toggle contextual overlays for displaying lists of links and more with the Bootstrap dropdown plugin.
Canvas has several methods for drawing paths, boxes, circles, text, and adding images.
Layout Templates We have created some responsive starter templates with CSS.
You are free to modify, save, share, and use them in all your projects.