HTML Interview Questions and Answers

How can I include comments in HTML?

An HTML comment begins with <!-- , ends with --> .The following are examples of HTML comments: 

<!-- This is a comment. -->
<!-- This is another comment, 
and it continues onto a second line. -->
<!---->

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What is HTML?

HTML stands for hypertext mark-up language.

Hyper is the opposite of linear. Old-fashioned computer programs were necessarily linear - that is, they had a specific order. But with a hyper language such as HTML, the user can go anywhere on the web page at any time. Text is just what you're looking at now - English characters used to make up ordinary words. Mark-up is what is done to the text to change its appearance. For instance, marking up your text with <b> before it and </b> after it will put that text in bold. Language is just that. HTML is the language that computers read in order to understand web pages. HTML stands for Hyper Text Markup Language HTML is not a programming language, it is a markup language.

Why we Place all External CSS Files within the Head Tag?

Moving style sheets to the document HEAD makes pages appear to be loading faster. This is because putting style sheets in the HEAD allows the page to render progressively.

What is the simplest HTML page?

HTML Code:

<HTML>

<HEAD> <TITLE>Welcome! </TITLE> </HEAD>

<BODY> Hello world! </BODY>

</HTML>

What is a html tag?

HTML markup tags are usually called HTML tags.
HTML tags are keywords surrounded by angle brackets like <html>.
HTML tags normally come in pairs like <b> and </b>.
The first tag in a pair is the start tag, the second tag is the end tag,
Start and end tags are also called opening tags and closing tags

What is the file extension of html?

The HTML file extension is .htm or .html

What is a hypertext link and how to create it?

A hypertext link is a special tag that links one page to another page or resource. If you click the link, the browser jumps to the link's destination.

The anchor element is used to define the start and/or destination of a hypertext link. A hyperlink (or link) is a word, group of words, or image that you can click on to jump to a new document or a new section within the current document.

Example: The <a href="http://www.webiwip.net/"> webiwip</a>

Can I nest tables within tables?

Yes, a table can be embedded inside a cell in another table. Here's a simple example:

<table  border='1'>
      <tr>
          <td>this is the first cell of the outer table</td>
            <td>this is the second cell of the outer table, with the inner table embedded in it
            <table  border='1'>
                    <tr>
                        <td>this is the first cell of the inner table</td>
                        <td>this is the second cell of the inner table</td>
                    </tr>
            </table>
            </td>
        </tr>
</table>
this is the first cell of the outer table this is the second cell of the outer table, with the inner table embedded in it
this is the first cell of the inner table this is the second cell of the inner table
What is html Meta element?

The <meta> tag provides metadata about the HTML document. Metadata will not be displayed on the page. 
Meta elements are typically used to specify page description, keywords, author of the document, last modified, and other metadata.
The <meta> tag always goes inside the head element.
The metadata can be used by browsers (how to display content or reload page), search engines (keywords), or other web services.

What are HTML Lists and html code for list items?

HTML lists are ordered and unordered
An unordered list starts with the <ul> tag. Each list item starts with the <li> tag. 
The list items are marked with bullets (typically small black circles). 

<ul>
<li>Coffee</li>
<li>Milk</li>
</ul> 


An ordered list starts with the <ol> tag. Each list item starts with the <li> tag. 
The list items are marked with numbers. 

<ol>
<li>Coffee</li>
<li>Milk</li>
</ol> 


A definition list is a list of items, with a description of each item. 
The <dl> tag defines a definition list.The <dl> tag is used in conjunction with <dt> (defines the item in the list) and <dd> (describes the item in the list): 

<dl>
<dt>Coffee</dt>
<dd>- black hot drink</dd>
<dt>Milk</dt>
<dd>- white cold drink</dd>
</dl> 

What is a html form?

HTML forms are used to pass data to a server. A form can contain input elements like text fields, checkboxes, radio-buttons, submit buttons and more. Example

<form action="./#" method="get" name="input">Username: <input name="user" type="text" /><br />
<input type="submit" value="Submit" /></form>
 
Can I have two or more actions in the same form?

No. A form must have exactly one action. However, the server-side program that processes your form submissions can perform any number of tasks.

What is a DOCTYPE?

According to HTML standards, each HTML document begins with a DOCTYPE declaration that specifies which version of HTML the document uses. Today, many browsers use the document's DOCTYPE declaration to determine whether to use a stricter, more standards-oriented layout mode.

What is the difference between the HTML form methods GET and POST?

As per functionality both GET and POST methods were same.

Difference is GET method will be showing the information information to the users. But in the case of POST method information will not be shown to the user.

GET method characters were restricted only to 256 characters. But in the case of POST method characters were not restricted.

GET method you can only use text as it sent as a string appended with the URL, but with POST is can text or binary.

GET is the default method for any form, if you need to use the POST method you have to change the value of the attribute method to be Post.

Why html page looks good on one browser, but not on another?

There are slight differences between browsers, such as Netscape Navigator and Microsoft Internet Explorer, in areas such as page margins. The only real answer is to use standard HTML tags whenever possible.

How can I display an image on my page?

Use an IMG element. The SRC attribute specifies the location of the image. The ALT attribute provides alternate text for those not loading images. For example: 

<img src='logo.gif' alt='ACME Products' />
What is the html frame?

With frames, you can display more than one HTML document in the same browser window. Each HTML document is called a frame, and each frame is independent of the others.

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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?

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