Web developer interview questions 2022

Explain what are the key responsibilities of a Web Developer ?

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

Explain what is CORS ? How does it work?

(CORS) Cross-Origin Resource Sharing 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.

Mention some tips you can use to reduce the load time of a web application that you have written ?

To decrease the load time of a web application you have to follow the following tips :

• Optimize images to no longer than screen resolution and save it as a compressed file
• Eliminate all JavaScript files to reduce the amount of transferable data
• Combine & Mininify all CSS and JS and call them in footer
• Defer or Asynch JS Files

Explain what is the difference between cookies and local storage ?

Cookies:

• Data accessible both at client side and server side. The data is sent to the serverside with every cookie request.
• Storage capacity of cookies is 4095 bytes/cookie.

Local Storage:

• Accessible. Server cannot use local
• Only at the local browser side data is storage until deliberately sent a request to the server via POST or GET.
• Storage capacity of local storage is 5MB per domain.

List out few ways you can reduce page load time ?

You can do following things to reduce the page load time:

• Reduce image size
• Remove unnecessary widgets
• HTTP compression
• Placing CSS at the top and script reference at the bottom or in external files
• Reduce lookups
• Minimize redirects Caching

List out the new APIs provided by HTML 5 standard?

HTML 5 comes with number of new APIs :

• Media API
• Text track API
• Application Cache API
• Data transfer API
• User Interaction
• Command API
• Constraint Validation API
• History API

How XHTML is different from HTML?

• XHTML requires that all tags should be in lowercase
• XHTML requires that all tags should be closed properly
• XHTML requires that all attributes are enclosed in double quotes
• XHTML forbids inline elements from containing block level elements

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