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Modules
- Basics of Programming
- Problem Solving
- Git
- HTML
- CSS
- Sass
- JavaScript
- PHP
- Laravel
Meetings
Challenges
Projects
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Results: 1578

Notes

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The following information is usually provided between these tags:

- Contact Information
- Privacy Policy
- Social Media Icons
- Terms of Service
- Copyright Information
- Sitemap and Related Documents

by Valeri Tandilashvili

HTML

tags

HTML5 Content Models

Metadata

: Content that sets up the presentation or behavior of the rest of the content. These elements are found in the head of the document. Elements:

<base>

<link>

<meta>

<noscript>

<script>

<style>

<title>

Embedded

: Content that imports other resources into the document. Elements:

<audio>

<video>

<canvas>

<iframe>

<img>

<math>

<object>

<svg>

Interactive

Content specifically intended for user interaction. Elements:

<a>

<audio>

<video>

<button>

<details>

<embed>

<iframe>

<img>

<input>

<label>

<object>

<select>

<textarea>

Heading

Defines a section header. Elements:

<h1>

<h2>

<h3>

<h4>

<h5>

<h6>

<hgroup>

Phrasing

This model has a number of inline level elements in common with HTML4. Elements:

<img>

<span>

<strong>

<label>

<br />

<small>

<sub>

, ...

by Valeri Tandilashvili

HTML

The List of HTML5 Content Models

In HTML, elements typically belonged in either the block level or inline content model. HTML5 introduces seven main content models

- Metadata
- Embedded
- Interactive
- Heading
- Phrasing
- Flow
- Sectioning

Note:

The HTML5 content models are designed to make the markup structure more meaningful for both the browser and the web designer

by Valeri Tandilashvili

HTML

HTML5 Integrated API

- Drag and Drop
- Audio and Video
- Offline Web Applications
- History
- Local Storage
- Geolocation
- Web Messaging

by Valeri Tandilashvili

HTML

HTML5 Forms

- The Web Forms 2.0 specification allows for creation of more powerful forms and more compelling user experiences. -

Date pickers

color pickers

, and

numeric stepper controls

have been added. - Input field types now include

email

search

, and

URL

. -

PUT

and

DELETE

form methods are now supported

by Valeri Tandilashvili

HTML

HTTP request methods that HTML forms support

HTML forms only support

GET

and

POST

as HTTP request methods. A workaround for this is to tunnel other methods through

POST

by using a

hidden form field

which is read by the server and the request dispatched accordingly

<input type="hidden" name="_method" value="DELETE">

However,

GET

POST

PUT

and

DELETE

are supported by the implementations of XMLHttpRequest (i.e. AJAX calls) in all the major web browsers (IE, Firefox, Safari, Chrome, Opera)

by Valeri Tandilashvili

HTML

final method cannot be overridden in child classes

This example demonstrates that a final method cannot be overridden in a child class

class myClass {
    final function myFunction() {
        echo "Parent";
    }
}
// ERROR because a final method cannot be overridden in child classes.
class myClass2 extends myClass {
    function myFunction() {
        echo "Child";
    }
}

The above code will generate the following error:

Fatal error: Cannot override final method myClass::myFunction() in /home/user/scripts/code.php on line 9

by Valeri Tandilashvili

PHP

final class cannot be inherited

Child class can not extend final class

final class A {
    final public static function who() {
        echo __CLASS__;
    }
}

class B extends A {
    
}

B::who();

Fatal error:

Class B may not inherit from final class (A)

by Valeri Tandilashvili

PHP

OOP

self keyword

The

self

keyword is needed to access a static property from a static method in a class definition

class myClass {
    static $myProperty = 42;
    static function myMethod() {
        echo self::$myProperty;
    }
}

myClass::myMethod();

by Valeri Tandilashvili

PHP

OOP

scope resolution operator

A static property or method is accessed by using the scope resolution operator :: between the class name and the property/method name

class myClass {
   static $myStaticProperty = 42;
}

echo myClass::$myStaticProperty;

by Valeri Tandilashvili

PHP

OOP

Results: 1578