Taken from w3schools.com – The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document.”

The W3C DOM standard is separated into 3 different parts:

• Core DOM – standard model for all document types
• XML DOM – standard model for XML documents
• HTML DOM – standard model for HTML documents

The HTML DOM is a standard object model and programming interface for HTML. It defines:

• The HTML elements as objects
• The properties of all HTML elements
• The methods to access all HTML elements
• The events for all HTML elements

In other words: The HTML DOM is a standard for how to get, change, add, or delete HTML elements.

Viewed as a hierarchical tree – image is in the w3schools link attached above

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Code via Chris Coyier and the CSS Tricks website   

Main reason for using a PHP include:

1. All code for a specific function is under 1 roof.
   1. If you need to make a change you change it in 1 spot instead of going to each and every individual page

When using and creating includes the files need to have the php extension on the file. 

Index.html turns into index.php  

Popular includes to create:

Footer.php
Header.php
Navigation.php 

Other examples:

Meta data/ stylesheets/ head information
Social media
Separate website tracking code if you don’t/can’t include it in the footer.  

General include statement: 

<?php include(“header.php”); ?>

PHP include statement from root.

<?php
$path = $_SERVER[‘DOCUMENT_ROOT’];
$path .= “/common/header.php”;
include_once($path);
?>

DISCLAIMER: when using PHP includes you HAVE TO ensure ALL OF YOUR LINKS are sourced from the root.

• All internal navigation
• Direct links from 1 page to another that is not in the navigation
• Image file locations

Generally speaking this is something to get into the habit of doing anyway, that way if you move something you don’t have to remember to fix the link. Also I do believe that this is a general web standard.

webdevpod.com

@tommnorman

@TNPWDesign

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