CSS Interview Questions and Answers

Can I include comments in my Style Sheet?

Yes. Comments can be written anywhere where whitespace is allowed and are treated as white space them. Anything written between /* and */ is treated as a comment (white space).

NOTE: Comments cannot be nested. /* this is a CSS-comment */

Post comment
Cancel
Thanks for your comment.!
Write a comment(Click here) ...
What is a Style Sheet?

Its also called Cascading Style Sheets or CSS. Style sheets are used to maintain standards in web pages. It give you a lot of power to define how your pages will look and allow easy to update your pages when you want to make a new design via load new style sheet onto your pages. 
With style sheets, a designer can define many aspects of a Web page: 
* fonts
* colors
* layout
* positioning
* image
* accessibility

Explain inline, embedded and external style sheets?

There are three ways of inserting a style sheet:
1. External style sheet 
2. Internal / embedded style sheet 
3. Inline style 

External Style Sheet: 
An external style sheet is good when the style is applied to many pages.With an external style sheet, you can change the look of an entire Web site by changing one file. Each page must link to the style sheet using the <link> tag. The <link> tag goes inside the head section: 

<head> 
<link rel='stylesheet' type='text/css' href='mystyle.css' /> 
</head> 

Internal/ Embedded Style Sheet: 
An internal style sheet should be used when a single document has a unique style. It needs to put in the head section of an HTML page, by using the <style> tag, like this:

<head> 
<style type='text/css'> 
hr {color:sienna} 
p {margin-left:20px} 
body {background-image:url('images/back40.gif')} 
</style> 
</head> 

Inline Styles : 
If only a small piece of code has to be styled then inline style sheets can be used. Inline style is the style attached to one specific element. The style is specified directly in the start tag as a value of the STYLE attribute. The style attribute can contain any CSS property. The example shows how to change the color and the left margin of a paragraph:

<p style='color: sienna; margin-left: 20px'>this is a paragraph. </p>
What are the advantages/disadvantages of the various style methods?

External Style Sheets

Advantages

Can control styles for multiple documents at once. Classes can be created for use on multiple HTML element types in many documents. Selector and grouping methods can be used to apply styles under complex contexts.

Disadvantages

An extra download is required to import style information for each document.The rendering of the document may be delayed until the external style sheet is loaded.Becomes slightly unwieldy for small quantities of style definitions.

Internal /Embedded Style Sheets

Advantages

Classes can be created for use on multiple tag types in the document.Selector and grouping methods can be used to apply styles under complex contexts.No additional downloads necessary to receive style information.

Disadvantages

This method can not control styles for multiple documents at once.

Inline Styles

Advantages

Useful for small quantities of style definitions.Can override other style specification methods at the local level so only exceptions need to be listed in conjunction with other style methods.

Disadvantages

Does not distance style information from content (a main goal of SGML/HTML).Can not control styles for multiple documents at once.Author can not create or control classes of elements to control multiple element types within the document.Selector grouping methods can not be used to create complex element addressing scenarios.

Can you specify more than one css class for any HTML element?

Yes, you can. Just provide a space between both the class names. 
like. 
<div class='class1 class2'> ......... </div>

What is ID selector?

ID selector is an individually identified (named) selector. Using the ID attribute the declared style can be associated with one and only one HTML element per document as to differentiate it from all other elements. ID selectors are created by a character # followed by the selector's name. The name can contain characters a-z, A-Z, digits 0-9, period, hyphen, escaped characters, Unicode characters 161-255, as well as any Unicode character as a numeric code, however, they cannot start with a dash or a digit. 
#ABC {color: red; background: black}
This and only this element can be identified as ABC 

<p id="ABC">Hello World!</p>

What is contextual selector?

Contextual selector is a selector that addresses specific occurrence of an element. It is a string of individual selectors separated by white space, a search pattern, where only the last element in the pattern is addressed providing it matches the specified context. 
TD P CODE {color: red}
The element CODE will be displayed in red but only if it occurs in the context of the element P which must occur in the context of the element TD. 
TD P CODE, H1 EM {color: red}
The element CODE will be displayed in red as described above AND the element EM will also be red but only if it occurs in the context of H1
P .footnote {color: red}
Any element with CLASS footnote will be red but only if it occurs in the context of P
P .footnote [lang]{color: red}
Any element with attribute LANG will be red but only if it is classed as 'footnote' and occurs in the context of P

What is Group Selectors?

By combining the grouping of selectors that share the same declaration and declarations that share the same selector you can apply multiple declarations to multiple selectors. This technique allows you to create compact yet powerful CSS rules. This tip combines Group Selectors with Group Declarations into one powerful technique. 
So this: 
body {font-size: 12px; }
body {font-family: arial, helvetica, sans-serif;} 
th {font-size: 12px; font-family: arial, helvetica, sans-serif;} 
td {font-size: 12px; font-family: arial, helvetica, sans-serif;} 


Becomes this: 
body, th, td {font-size: 12px; font-family: arial, helvetica, sans-serif;} 

What is css class?

Class is a group of 
1) instances of the same element to which an unique style can be attached 
2) instances of different elements to which the same style can be attached. 

Is CSS case sensitive?
Cascading Style Sheets (CSS) is not case sensitive. However, font families, URLs to images, and other direct references with the style sheet may be.

Which set of definitions, HTML attributes or CSS properties, take precedence?

CSS properties take precedence over HTML attributes. If both are specified, HTML attributes will be displayed in browsers without CSS support but won't have any effect in browsers with CSS support.

What is the difference between ID and CLASS?

ID identifies and sets style to one and only one occurrence of an element while class can be attached to any number of elements. 

ID started by hash(#)

Each element can have only one ID.
Each page can have only one element with that ID.

#eva1 {background: red; color: white}

<div id="eva1">

CLASS started by dot(.)

You can use the same class on multiple elements.
You can use multiple classes on the same element.

<div id="eva2">

Latest Updates

Pipes and Cistern

Two pipes A and B can fill a tank in 6 hours and 4 hours respectively. If they are opened on alternate hours and if pipe A s opened first, in how many hours, the tank shall be full?

A large tanker can be filled by two pipes A and B in 60 min and 40 min respectively. How many minutes will it take to fill the tanker from empty state if B is used for first half of the time, and A and B fill it together for the other half?

A tank is filled by 3 pipes with uniform flow. The first two pipes operating simultaneously fill the tank in the same time during which the tank is filled by the third pipe alone. The 2nd pipe fills the tank 5 hours faster than first pipe and 4 hours slower than third pipe. The time required by first pipe is?

Two pipes A and B together can fill a cistern in 4 hours. Had they been opened separately, then B would have taken 6 hours more than A to fill the cistern. How much time will be taken by A to fill the cistern separately?

Two pipes A and B can fill a tank in 24 min and 32 min respectively. If both the pipes are opened simultaneously, after how much time B should be closed so that the tank is full in 18 min?

Two pipes A and B can fill a tank in 36 min and 45 min respectively. A water pipe C can empty the tank in 30 min. First A and B are opened. after 7 min, C is also opened. In how much time, the tank is full?

Two pipes can fill a cistern in 14 hours and 16 hours respectively. The pipes are opened simultaneously and it is found that due to leakage in the bottom it took 32 min more to fill the cistern. When the cistern is full, in what time will the leak empty it?

Bucket P has thrice the capacity as Bucket Q. It takes 60 turns for Bucket P to fill the empty drum. How many turns it will take for both the buckets P and Q, having each turn together to fill the empty drum?

Probability

In a class , 30 % of the students offered English, 20 % offered Hindi and 10 % offered Both.If a student is offered at random, what is the probability that he has offered English or Hindi?

In a lottery ,there are 10 prizes and 25 blanks.A lottery is drawn at random. what is the probability of getting a prize ?

Two dice are thrown simultaneously .what is the probability of getting two numbers whose product is even?

Two diced are tossed the probability that the total score is a prime number?

Two cards are drawn at random from a pack of 52 cards What is the probability that either both are black or both are queens?

Two dice are thrown together .What is the probability that the sum of the number on the two faces is divisible by 4 or 6?

A bag contains 6 white and 4 black balls .Two balls are drawn at random .Find the probability that they are of the same colour?

In a simultaneous throw of a pair of dice,find the probability of getting a total more than 7?

An unbiased die is tossed.Find the probability of getting a multiple of 3?

Problems on Ages

My brother is 3 years elder to me. My father was 28 years of age when my sister was born while my mother was 26 years of age when i was born. If my sister was 4 years of age when my brother was born,then what was the age my father and mother respectively when my brother was born?

Latest Job Notifications

Banking Jobs

बैंकिंग कार्मिक चयन संस्थान Institute of Banking Personnel Selection(IBPS) - 7855 पद - 29/07/2022 अंतिम तिथि

SSC Recruitment

कर्मचारी चयन आयोग (एसएससी) Staff Selection Commission (SSC) - 1411 पद - 29/07/2022 अंतिम तिथि

Jobs in Rajasthan

राजस्थान अधीनस्थ और मंत्रिस्तरीय सेवा चयन बोर्ड Rajasthan Subordinate and Ministerial Services Selection Board (RSMSSB) - 5546 पद - 22-Jul-2022 अंतिम तिथि

Railway Recruitment

उत्तर मध्य रेलवे भर्ती प्रकोष्ठ Railway Recruitment Cell(NCR) - 1659 पद - 01/08/2022 अंतिम तिथि

Jobs in West Bengal

इंडियन पोस्ट सर्विस Indian Post Service - 2357 पद - 19/08/2021 अंतिम तिथि - पश्चिम बंगाल पोस्टल सर्कल

Banking Jobs

भारतीय स्टेट बैंक State Bank of India(SBI) - 6100 पद - 26/07/2021 अंतिम तिथि - CRPD/APPR/2021-22/10

SSC Recruitment

कर्मचारी चयन आयोग Staff Selection Commission(SSC) - 25271 पद - 31/08/2021 अंतिम तिथि

Jobs in Madhya Pradesh

राष्ट्रीय स्वास्थ्य मिशन मध्य प्रदेश National Health Mission MP(NRHM) - 5215 पद - 22/06/2021 अंतिम तिथि

Jobs in Punjab

पंजाब स्टेट पावर कॉर्पोरेशन लिमिटेड Punjab State Power Corporation Limited (PSPCL) - 2632 पद - 20/06/2021 अंतिम तिथि

Jobs in Chhattisgarh

स्वास्थ्य सेवा निदेशालय, छत्तीसगढ़ Department of Health & Family Welfare, Chhattisgarh - 267 पद - 26/06/2021 अंतिम तिथि