December 2010
Beginner
455 pages
9h 37m
English
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Chapter 1. Adding JavaScript to a Web Page
When JavaScript was first introduced to web pages, Netscape needed to find some mechanism that allowed JavaScript to be added to a web page without causing adverse effects in other browsers. After much debate, it was finally settled on to incorporate the <script/> element, which was later added to the HTML specification.
THE <SCRIPT/> ELEMENT
The primary means of adding JavaScript to a web page is by using the <script/> element. This element, introduced by Netscape, became part of the HTML 3.2 specification as a placeholder for a transition to HTML 4.01, in which the element was fleshed out and given the following attributes:
src: Optional. Specifies an external script file to be executed.type: Required. Specifies the language used in the<script/>element's contents, and a value of"text/javascript"is typically used. Even though this attribute is required by the HTML specification, all browsers assume the language is JavaScript if this attribute is omitted.language: Deprecated. This attribute specifies the language used in the<script/>element's contents. This attribute is no longer used, astypehas replaced it.defer: Optional. A Boolean (trueorfalse) value that tells the browser whether to wait to execute any code within the<script/>element until after the browser loads the entire HTML document.charset: Optional. The character encoding of the external code file specified by thesrcattribute. This attribute is rarely used.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.