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Knowledge::Object

HTML Introduction
DataEase 8 WebFields/HTMLEdit only. DG3 ALL!

HTML Example

<!DOCTYPE html>
<html>
<body>

<h1>My First Heading</h1>

<p>My first paragraph.</p>

</body>
</html>


Try it yourself »

Example Explained

  • The DOCTYPE declaration defines the document type
  • The text between <html> and </html> describes the web page
  • The text between <body> and </body> is the visible page content
  • The text between <h1> and </h1> is displayed as a heading
  • The text between <p> and </p> is displayed as a paragraph
[img src="http://www.w3schools.com/images/lamp.jpg" width="32" height="32" alt="lamp">

What is HTML?

HTML is a language for describing web pages.

  • HTML stands for Hyper Text Markup Language
  • HTML is a markup language
  • A markup language is a set of markup tags
  • The tags describe document content
  • HTML documents containHTML tags and plain text
  • HTML documents are also called web pages

HTML Tags

HTML markup tags are usually called HTML tags

  • HTML tags are keywords (tag names) surrounded by angle brackets like <html>
  • HTML tags normally come in pairs like <b> and </b>
  • The first tag in a pair is the start tag, the second tag is the end tag
  • The end tag is written like the start tag, with a forward slash before the tag name
  • Start and end tags are also called opening tags and closing tags

<tagname>content</tagname>


HTML Elements

"HTML tags" and "HTML elements" are often used to describe the same thing.

But strictly speaking, an HTML element is everything between the start tag and the end tag, including the tags:

HTML Element:

<p>This is a paragraph.</p>


Web Browsers

The purpose of a web browser (such as Google Chrome, Internet Explorer, Firefox, Safari) is to read HTML documents and display them as web pages.

The browser does not display the HTML tags, but uses the tags to determine how the content of the HTML page is to be presented/displayed to the user:

[img alt="Browser" height="304" src="http://www.w3schools.com/html/pic_ie.jpg" width="569">

HTML Page Structure

Below is a visualization of an HTML page structure:

<html>

<body>

<h1>This a heading</h1>

<p>This is a paragraph.</p>

<p>This is another paragraph.</p>

</body>

</html>

HTML Versions

Since the early days of the web, there have been many versions of HTML:

VersionYear
HTML1991
HTML+1993
HTML 2.01995
HTML 3.21997
HTML 4.011999
XHTML 1.02000
HTML52012
XHTML52013

The <!DOCTYPE> Declaration

The <!DOCTYPE> declaration helps the browser to display a web page correctly.

There are many different documents on the web, and a browser can only display an HTML page 100% correctly if it knows the HTML type and version used.

Common Declarations

HTML5

<!DOCTYPE html>

HTML 4.01

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">

XHTML 1.0

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

For a complete list of document type declarations, go to our DOCTYPE Reference.

Parameters


Returns/Result


Examples


Reference

See Also


On the forum about HTML Introduction

[@EOF@]...

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Hi there,I am trying to use an external MySQL DB in dataease. I have successfully create the ODBC link and added the DB to dataease. I can also access the DB from dataease. Now, just for testing purposes, I am trying to create a simple report b...

Product: DataEase for Windows 7.x. Written by George Washington 11/04/14 at 08:26:17

no se pude exportar ahora archivos a pdf, ni a excel o otros cosa mala. en verdad creo que hace faltaen las versiones anteriores me funcionaba mas o menos bien.&nbsp;le hace falta a los aplicativos que se desarrollan en Dataeasegr...

Product: DataEase 8 Reporter. Written by eduardo paez 02/05/14 at 14:40:11

Thanks. Anyway I'm trying to use this fuction but it seems to me that it doesn't work on 8.2. I tried also in a DQL.There's something wrong?<img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAA9IAAAJ3CAYAAAB4NWk3AAAAAXNSR0IArs4...

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[@EOF@]...

Product: Dataease [{8}]FIVE. Written by Chamil Rajindra 21/02/19 at 10:17:46

Thanks for the very good explanation!AS...

Product: . Written by afonso santos 28/10/19 at 00:50:14

I am pleased to see that the migration from Dos 4.53 is then sa 5.5 works. A really useful thing would be a compiler of SQL languages. Will you get there?Original Text:Mi compiaccio a vedere che la migrazione da Dos 4.53 è poi sa 5.5 funzio...

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[@EOF@]...

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