Book Image

Mastering Bootstrap 4 - Second Edition

By : Benjamin Jakobus
Book Image

Mastering Bootstrap 4 - Second Edition

By: Benjamin Jakobus

Overview of this book

Bootstrap 4 is a free CSS and JavaScript framework that allows developers to rapidly build responsive web interfaces. This book will help you use and adapt Bootstrap to produce enticing websites that fit your needs. You will build a customized Bootstrap website from scratch, using various approaches to customize the framework with increasing levels of skill. You will get to grips with Bootstrap's key features and quickly discover various ways in which Bootstrap can help you develop web interfaces. Then take a walk through the fundamental features, such as its grid system, global styles, helper classes, and responsive utilities. When you have mastered these, you will discover how to structure page layouts, utilize Bootstrap's various navigation components, use forms, and style different types of content. Among other things, you will also tour the anatomy of a Bootstrap plugin, create your own custom components, and extend Bootstrap using jQuery. You will also understand what utility classes Bootstrap 4 has to offer, and how you can use them effectively to speed up the development of your website. Finally, you will discover how to optimize your website and integrate it with third-party frameworks. By the end of this book, you will have a thorough knowledge of the framework's ins and outs, and will be able to build highly customizable and optimized web interfaces.
Table of Contents (18 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Toggling visibility


Bootstrap provides several helper classes to allow you to toggle content visibility. Theinvisibleclass sets the element's visibilityproperty tohidden. Similarly, the visible class sets the visibility property to visible:

.visible {
     visibility: visible !important;
}
.invisible {
     visibility: hidden !important;
}

To hide just the text within an element, the text-hide class can be used. This class resets the font property and sets the font color to transparent so that any text is no longer visible without it being required to be cleared. The class also ensures that there are no text shadows or borders:

.text-hide {
     font: 0/0 a;
     color: transparent;
     text-shadow: none;
     background-color: transparent;
     border: 0;
}

In addition, the sr-only and sr-only-focusable classes ensure that an element is only visible to screen readers, that is, thesr-onlyclass hides an element except from screen readers; sr-only-focusableextends this functionality so the element...