CSS INTERVIEW QUESTIONS SET 2

 



You make also like this CSS interview question set 1.

Let's begin with set 2,

5)What is the difference between opacity 0 vs display none vs visibility hidden?

Property           | occupies space | consumes clicks |

+--------------------+----------------+-----------------+

| opacity: 0         |        yes      |        yes       |

+--------------------+----------------+-----------------+

| visibility: hidden |        yes       |        no        |

+--------------------+----------------+-----------------+

| display: none      |        no       |        no        |


When we say it consumes click, that means it also consumes other pointer-events like onmousedown,onmousemove, etc.


In essence "visibility: hidden" behaves like a combination of "opacity: 0" and "pointer-events: none".

6)CSS 3 new features?

CSS3 allows developers to style HTML elements easier. 
They are less dependent on image files 
and can complete CSS styling with fewer lines of code.
CSS3 is the latest evolution of the Cascading Style Sheets language and aims at extending CSS2.1. 
It brings a lot of new features and additions, like rounded corners, shadows, gradients,
 transitions or animations, as well as new layouts like multi-columns, 
flexible box or grid layouts.

Box Shadow
One of the CSS3 new features is the box-shadow property that adds a shadow to an element. Instead of using multiple images around an item, this property lets you add shadow with a short line of code.

Opacity
One of the CSS3 properties called opacity makes elements see-through or completely transparent.

For instance, you can apply opacity to images or other HTML elements. The transparency level depends on the indicated values.

Rounded Corners
Before the release of CSS3, developers had to write long code to produce rounded corners.
 Now, it is enough to apply the border-radius CSS3 property to HTML elements.

New Colors
One of the CSS3 features is the addition of new colors:

RGBA
HSL
HSLA
Gradient Colors

Attribute Selectors:
CSS3 also introduced new selectors in addition to the ones in CSS2.
Instead of applying IDs or classes for styling, developers can select HTML elements according to their attributes.

Refer to this link for a detailed study.


7)Css 3 flexbox ?

The Flexible Box Layout Module, 
makes it easier to design flexible responsive layout structure without
using float or positioning.
Before the Flexbox Layout module, there were four layout modes:
Block, for sections in a webpage
Inline, for text
Table, for two-dimensional table data
Positioned, for the explicit position of an element
a)To start using the Flexbox model, you need to first define a flex container.
b)The flex container becomes flexible by setting the display property to flex:

Check this link for more details https://www.w3schools.com/css/css3_flexbox.asp.

I hope you like this article.
Please stay connected for the CSS interview questions set 3.
 
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Written By:

Saurabh Joshi

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