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Web Developers Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM WEB INTERVIEW QUESTIONS WEB DEVELOPERS INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Web Developers Interview Questions & Answers - Learning Mode

A web developer is a programmer who specializes in, or is specifically engaged in, the development of World Wide Web applications, or distributed network applications that are run over HTTP from a web server to a web browser. A web developer is a programmer who specializes in, or is specifically engaged in, the development of World Wide Web applications, or distributed network applications that are run over HTTP from a web server to a web browser.

Try Web Developers Interview Questions & Answers - Exam Mode

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Web Developers Interview Questions & Answers - Learning Mode
Try Web Developers Interview Questions & Answers - Exam Mode
Question: Explain what is Long Polling?

Answer: Long Polling is a web application development pattern used to emulate pushing data from the server to the client. With long polling, the client requests information from the server in a similar way to a normal poll. However, if the server does not have any information available for the client, instead of sending an empty response, the server holds the request and waits for some information to be available. Source: CoolInterview.com
Question: What are some new HTML5 markup elements?

Answer: Among several: <article>, <aside>, <bdi>, <command>, <details>, <figure>, <figcaption>, <summary>, <header>, <footer>, <hgroup>, <mark>, <meter>, <nav>, <progress>, <ruby>, <rt>, <section> and <time>. Source: CoolInterview.com
Question: Explain what is Long Polling?

Answer: Long Polling is a web application development pattern used to emulate pushing data from the server to the client. When the long polling is used, the client sends a request to the server, and the connection remains intact until the server is ready to send data to the client. The connection will be closed only after the data is sent back to the client or connection timeout occurs. Source: CoolInterview.com
Question: In HTML what tag can be used for a multi-line text input control?

Answer: For multi-line text input control, you can use the ?textarea tag?. Source: CoolInterview.com
Question: What is the difference between HTML elements and tags?

Answer: HTML elements communicate to the browser how to render text. When surrounded by angular brackets <> they form HTML tags, which come in pairs and surround text. Source: CoolInterview.com
Question: What are the possible ways to apply CSS styles to a web page?

Answer: Linked: Create a separate .css file and add all the style for the web page there. Make sure the file is linked to the HTML document(s) using the link tag
Embedded: Inside the HTML document, open a style tag and inside that, add all styles just like you?d do on a linked file.
Inline: This is done by adding a style attribute inside an HTML element. Source: CoolInterview.com
Question: Explain what are the key responsibilities of a Web Developer?

Answer: Program test and debug all web applications
Design, develop, test and deploy web applications
Uploading sites onto server and registering it with different search engines
Coordinate with other designers and programmers to develop web projects
Fix bugs, troubleshoot and resolve problems
In case of system failure initiate periodic testing and implement contingency plans
Develop appropriate code structures to solve specific tasks
Support and assist in the upkeep and maintenance Source: CoolInterview.com
Question: Explain what is DTD (Document Type Declaration)?

Answer: A DTD means Document Type Definition (DTD) which defines the structure, legal elements and attributes of an XML document.

PCDATA: A PCDATA is a Parsed Character Data. XML parsers usually parse all the text in an XML document.
CDATA: While CDATA is an Unparsed Character Data, the term CDATA is used about text data that should not be parsed by the XML parser. Source: CoolInterview.com
Question: What are the new image elements in HTML5?

Answer: The new image elements in HTML5 are Canvas and WebGL. <canvas> is a new element that acts as a container for graphical elements like images and graphics. WebGL stands for Web Graphics Language, a free cross-platform API that is used for creating 3D graphics in web browsers. Source: CoolInterview.com
Question: What is the advantage of collapsing White Space?

Answer: White Spaces are blank sequences of space characters, which is actually treated as a single space character in HTML. The browser collapses multiple space into a single space, so we can indent lines of text without worrying about multiple spaces. This enables us to organize the code into a much more readable format. Source: CoolInterview.com
Question: Explain what is an ETag and how does it work?

Answer: An ETag is an opaque identifier allocated by a web server to a specific version of a resource found at a URL. The ETag is a part of HTTP, the protocol for the world wide web and when the server reads the ETag from client request, the server can then tell whether to send the file (HTTP 200) or tell the client just to use their local copy (HTTP 304). Source: CoolInterview.com
Question: Describe/demonstrate your level of competence in a nix shell environment?

Answer: See how well they work without their precious GUI. Ask some basic questions like how they would recursively copy a directory from one place to another, or how you'd make a file only readable by the owner. Find out what OSs they have experience with. Source: CoolInterview.com
Question: How do you create links to sections within the same page?

Answer: Links can be created using the <a> tag, with referencing through the use of the # symbol. For example, we can have:
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<a href=?#top?>BACK TO TOP</a>
which would result in the words ?BACK TO TOP? appearing on the webpage and links to a bookmark named top. We can then create a separate tag like:
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<a name=top></a>
somewhere on the same webpage so that the user will be linked to that place when clicking on ?BACK TO TOP?. Source: CoolInterview.com
Question: Do you find any particular languages or technologies intimidating?

Answer: Almost all developers have personal web projects they like to plug away at in their spare time. This is another question that can help differentiate the passionate developers from the clock-punchers. It's also a good question to end an interview with, as it's usually easy (and fun) for them to answer. Source: CoolInterview.com
Question: How comfortable are you with writing HTML entirely by hand?

Answer: Although their resume may state that they are an HTML expert, often times many developers ca not actually write an HTML document from top to bottom. They rely on an external publisher or have to constantly flip back to a reference manual. Any developer worth a damn should at least be able to write a simple HTML document without relying on external resources. A possible exercise is to draw up a fake website and ask them to write the HTML for it. Keep it simple and just make sure they have the bas Source: CoolInterview.com
Question: Describe the difference between Cookies, sessionStorage and localStorage?

Answer: Cookies are small text files that websites place in a browser for tracking or login purposes, and hold a modest amount of data. Meanwhile, localStorage and sessionStorage are new objects, both of which are storage specifications but vary in scope and duration. Local storage is more secure, and large amounts of data can be stored locally, without affecting website performance. Futhermore, is it permanent. sessionStorage only lasts as long as the duration of the longest open tab. Source: CoolInterview.com
Question: Do all HTML elements need both opening and closing tags?

Answer: Not really, elements like <img src=""/> or <input type=""/> don?t need a closing tag. Source: CoolInterview.com
Question: Explain what is Cross-Origin Resource Sharing (CORS)? How does it work?

Answer: Cross-Origin Resource Sharing (CORS) is a mechanism that enables many resources (e.g., JavaScript, fonts etc.) on a web page to be requested from another domain outside the domain from which the resource originated. It is a mechanism supported in HTML5 that manages XMLHttpRequest access to a domain different. Source: CoolInterview.com
Question: List out the advantage of HTTP/2 as compared with HTTP 1.1?

Answer: The advantage of HTTP/2 compared to HTTP/1.1 is

HTTP headers data compression
Server push technologies
Over a single TCP connection parallel loading of page elements
Prioritization of request Source: CoolInterview.com
Question: Mention what is the correct way to include JavaScript into your HTML?

Answer: The correct way to include JavaScript into your HTML is by using inline event handlers or inline code. Source: CoolInterview.com

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