Basically a pseudo-class is a selector that assists in the selection of something that cannot be expressed by a simple selector, for example :hover . A pseudo-element however allows us to create items that do not normally exist in the document tree, for example ``::after`.Beside this, what is the difference between pseudo element & pseudo classes in CSS?
A pseudo-class is similar to a class in HTML, but it's not specified explicitly in the markup. Some pseudo-classes are dynamic—they're applied as a result of user interaction with the document. A pseudo-element refers to things that are part of the document, but you just don't know it yet. For example the first letter.
Subsequently, question is, what are CSS pseudo classes? A CSS pseudo-class is a keyword added to a selector that specifies a special state of the selected element(s). For example, :hover can be used to change a button's color when the user's pointer hovers over it.
Likewise, what are pseudo elements CSS?
A CSS pseudo-element is a keyword added to a selector that lets you style a specific part of the selected element(s). For example, ::first-line can be used to change the font of the first line of a paragraph.
What does a pseudo class represent?
A pseudo-class is used to define a special state of an element. For example, it can be used to: Style an element when a user mouses over it. Style visited and unvisited links differently.
What is :: before and :: after?
The ::before selector inserts something before the content of each selected element(s). Use the content property to specify the content to insert. Use the ::after selector to insert something after the content.What are pseudo elements used for?
A CSS pseudo-element is used to style specified parts of an element. For example, it can be used to: Style the first letter, or line, of an element. Insert content before, or after, the content of an element.What does * mean in CSS?
This is a common technique called a CSS reset. Different browsers use different default margins, causing sites to look different by margins. The * means "all elements" (a universal selector), so we are setting all elements to have zero margins, and zero padding, thus making them look the same in all browsers.What is :: Before HTML?
::before and ::after refer to CSS pseudo-elements that are created before and after matching elements. Pseudo-elements are typically not shown in HTML element trees. However, if you are using the right kind of a debugging tool (like Chrome inspector) you can see these special elements.What is :: after in CSS?
In CSS, ::after creates a pseudo-element that is the last child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default.Is Pseudo a class?
A pseudo-class is a selector that selects elements that are in a specific state, e.g. they are the first element of their type, or they are being hovered over by the mouse pointer.What is :: After in HTML?
::after. ::after is a pseudo-element which allows you to insert content onto a page from CSS (without it needing to be in the HTML).What is Z index in CSS?
Definition and Usage. The z-index property specifies the stack order of an element. An element with greater stack order is always in front of an element with a lower stack order. Note: z-index only works on positioned elements (position: absolute, position: relative, position: fixed, or position: sticky).What is meant by Dom?
The Document Object Model (DOM) is a programming API for HTML and XML documents. It defines the logical structure of documents and the way a document is accessed and manipulated. Nevertheless, XML presents this data as documents, and the DOM may be used to manage this data.How do you use hover pseudo class?
The :hover pseudo-class, also called the “pointer hover pseudo-class”, applies when a pointing device interacts with an element without necessarily activating it. A typical example of this is when a mouse ?? hovers over an element. If you hover your mouse over the button below, you'll see that it turns yellow.How do you use pseudo elements in HTML?
The first-letter pseudo element applies to the first letter inside a box and first-line to the top-most displayed line in a box. Targeting the first letter and first line of a paragraph with pseudo elements. The CSS 3 specs suggest pseudo elements should include two colons, so p::first-line as opposed to p:first-line .What does display block mean?
display: block means that the element is displayed as a block, as paragraphs and headers have always been. A block has some whitespace above and below it and tolerates no HTML elements next to it, except when ordered otherwise (by adding a float declaration to another element, for instance).What does before mean in CSS?
In CSS, ::before creates a pseudo-element that is the first child of the selected element. It is often used to add cosmetic content to an element with the content property. It is inline by default. /* Add a heart before links */ a::before { content: " ♥ "; }Why is used in CSS?
CSS selectors are used to "find" (or select) the HTML elements you want to style. Pseudo-elements selectors (select and style a part of an element) Attribute selectors (select elements based on an attribute or attribute value)Can I use HTML 5?
It's really easy and simple language to understand in this new version. Modern and popular browsers such as Chrome, Firefox, Safari and Opera support HTML5. Any page made in HTML5 is compatible with both computers and mobile devices. In other words, you can set the mobile specification from the HTML document itself.What does colon mean in CSS?
It means pseudo element selector. It means the element to the right doesn't exist in the normal DOM, but can be selected. A pseudo-element is made of two colons (::) followed by the name of the pseudo-element. Source.What is a type selector?
A Type Selector (sometimes referred to as an Element Type Selector) matches elements with the corresponding element node name, such as <p>, <span> , and <div> tags. Type selectors are generally used to make "broad stroke" changes to the style of a site. 
