gs gs106 Invocation and Performance Navigation - JavaScript Lazy Loading - Quiz No.2
gs gs106 Javascript Quiz
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Question 1: What is the initial step to set up a CSS Lazy Loading?
Fetching data
Loading the script
Loading the page
Adding the event listener
Question 2: What is being done in the following JavaScript code?
<script> if (window.attachEvent) window.attachEvent('onload', fetch); else window.addEventListener('load', fetch, false); </script>
Event and EventListener is created according to the if-else
The values are updated
The value is called
The values are stored
Question 3: What is the purpose of holding whatever tag you create in the attribute type?
To have more information
To identify the scripting language
To store data
To store variable name
Question 4: What does the appendChild() method perform?
Appends a node in the middle of the index taken as the parameter
Appends a node as the first child
Appends a node as the last child
Replaces and appends at the last node
Question 5: What is being done in the following JavaScript code?
<script> function fetch() { remoteLoader.loadJS("/lab/perfLogger.js", init) remoteLoader.loadCSS(["/style/base.css", "http://fonts.googleapis.com/css?family=Metrophobi c&v2"]) } </script>
JS and CSS files are deleted
CSS is replaced with JS
JS is replaced with CSS
JS and CSS files are loaded
Question 6: What should be the value of the type attribute of a variable if the type of file is CSS?
text/js/css
text/js
text/css
text
Question 7: How to lazy load images?
Remove the rel attribute
Remove the src attribute
Make rel = src
Make src = rel
Question 8: What does the rel attribute of a variable have when the type of file is CSS?
css
stylesheet
text/css
plainsheet
Question 10: How do we stop blocking of loading and executing the perfLogger, a logging type data?
Inlining the perfLogger
Removing the perfLogger
Placing the perfLogger before the “script” tag
Placing the perflogger after the “script” tag
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