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Put Together a CSS Stylesheet

An HTML document is very structural – every element has its place, and the order of elements is crucial for the final construction and appearance of the web page in question. A CSS document is a lot less so.

CSS documents are often referred to as stylesheets. Basically, a CSS stylesheet is a list of all the class definitions that are being used in the corresponding HTML document. The order of the class definitions is not that crucial most of the time (at least for simple designs).

The way you put a CSS stylesheet together is by defining each class one by one, and then testing if the outcome in your page design is what you wanted.

This sounds like tedious work, and it is.

But we’ll make things easier on you, and not force you to learn HTML and CSS design by hand. Instead of teaching you everything from scratch, we’ll take a living organism and dissect its elements.

This is where a thing called Bootstrap comes into play.

Get to Know CSS Selectors

Just like HTML has its tags, CSS has selectors.

Selectors describe how a given element should behave appearance-wise. Here’s an example of a CSS selector:

p {

font-size: 18px;

}

This selector indicates that all HTML tags within the document will have a font size of 18px.

However, a more practical way of using CSS selectors is not to restrict all tags of a given type to a certain styling, but rather create different “classes” and assign them to tags one by one.

For example, a class selector in CSS looks like this:
normal-text {

font-size: 18px;

}

Notice the dot (.) before the name of the class (normal-text). With the “normal-text” class defined, we can now assign that class to those specific HTML tags that we want to make 18px in size.

For example:

This text is going to be 18px.

Let’s take one more minute to explain all the elements of that piece of CSS code above:
normal-text – class definition; everything after the name of the class and between the opening and closing brackets {} defines what the elements assigned to this class will look like

font-size – an example CSS property

18px – a value assigned to the property

There’s a ton of CSS properties apart from the above font-size. Here’s the complete list if you’re curious.

HTML TAGS AND MEANINGS

Network Security – Access Control

Network access control is a method of enhancing the security of a private organizational network by restricting the availability of network resources to endpoint devices that comply with the organization’s security policy. A typical network access control scheme comprises of two major components such as Restricted Access and Network Boundary Protection.

Restricted Access to the network devices is achieved through user authentication and authorization control which is responsible for identifying and authenticating different users to the network system. Authorization is the process of granting or denying specific access permissions to a protected resource.

Network Boundary Protection controls logical connectivity into and out of networks. For example, multiple firewalls can be deployed to prevent unauthorized access to the network systems. Also intrusion detection and prevention technologies can be deployed to defend against attacks from the Internet.

In this chapter, we will discuss the methods for user identification and authentication for network access followed by various types of firewalls and intrusion detection systems.

Securing Access to Network Devices

Restricting access to the devices on network is a very essential step for securing a network. Since network devices comprise of communication as well as computing equipment, compromising these can potentially bring down an entire network and its resources.

Paradoxically, many organizations ensure excellent security for their servers and applications but leave communicating network devices with rudimentary security.

An important aspect of network device security is access control and authorization. Many protocols have been developed to address these two requirements and enhance network security to higher levels.

User Authentication and Authorization

User authentication is necessary to control access to the network systems, in particular network infrastructure devices.

How to create download image
I generate normal links like: in a web app.

When I click on the link, it displays the picture in a new page. If you want to save the picture, then you need to right click on it and select "save as"

I don't want this behaviour, I would like to have a download box popping out when I click on the link, is that possible just with html or javascript? How?

If not I guess I would have to write a download.php script and call it into the href with the file name as parameter...?