How does document.write() impact the performance of a webpage? | JavaScript | MYTAT

Q

How does document.write() impact the performance of a webpage?

A). It improves the performance by reducing page load times. B). It has no impact on performance. C). It may degrade performance due to delays in content rendering. D). It optimizes code execution for better performance.

Answer & Solution

Answer: Option Option C

Solution:

document.write() may degrade performance on a webpage due to delays in content rendering, especially if used extensively or after the document has loaded. When document.write() is executed, it modifies the HTML structure of the page, potentially causing reflows and repaints, which can impact performance. To optimize performance, it is recommended to use alternative methods such as DOM manipulation or innerHTML for dynamic content generation and avoid using document.write() after the document has loaded.

Related Questions on Average

How does document.write() differ from innerHTML in JavaScript?

A). document.write() can only write plain text content.

B). document.write() can only write HTML content.

C). innerHTML can execute JavaScript code within the written content.

D). innerHTML can write content within specific HTML elements.

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Which JavaScript feature complements document.write() for dynamic content generation?

A). Fetch API

B). innerHTML

C). event listeners

D). CSS transitions

View Answer

How can document.write() be used to dynamically load external content in JavaScript?

A). By including external JavaScript files.

B). By embedding external content directly into the code.

C). By generating <script> tags with external sources.

D). By writing content with embedded URLs.

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What is the primary purpose of using document.write() in JavaScript?

A). To modify existing HTML elements

B). To add event listeners to HTML elements

C). To generate and output dynamic content to a webpage

D). To validate user input

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Which approach should be followed when using document.write() in JavaScript for dynamic content?

A). Encapsulating JavaScript code within functions.

B). Utilizing external JavaScript libraries.

C). Including multiple document.write() statements within one script.

D). Executing document.write() before the <body> tag.

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Which method can be used to ensure proper document structure when using document.write() in JavaScript?

A). Using document.createElement() alongside document.write().

B). Including document.write() within external script files.

C). Combining document.write() with external CSS stylesheets.

D). Executing document.write() after the document has loaded.

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How can document.write() be used to create a simple HTML list dynamically?

A). By concatenating strings with <li> tags.

B). By including <ul> and <li> tags directly within the code.

C). By generating <ul> and <li> elements using JavaScript functions.

D). By using CSS transitions to animate list items.

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What happens if document.write() is used within an external script file?

A). It appends content to the end of the document.

B). It overwrites the entire content of the document.

C). It triggers an error in the browser console.

D). It inserts content into the <head> section.

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Which method is commonly used as an alternative to document.write() for dynamic content generation in modern JavaScript development?

A). jQuery

B). React.js

C). AJAX requests

D). innerHTML

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Which of the following is a limitation of using document.write() in JavaScript?

A). It cannot write HTML content.

B). It cannot write content after the document has loaded.

C). It cannot write content within specific HTML elements.

D). It cannot write content dynamically.

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