Question 31 : What is the type of datatype the async attribute optionally accepts?
1. Integer
2. String
3. Boolean
4. Decimal
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Question 32 : How to lazy load images?
1. Remove the rel attribute
2. Remove the src attribute
3. Make rel = src
4. Make src = rel
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Question 33 : Which of the following property is associated with the Request event?
1. requestStart
2. requestEnd
3. both requestStart and requestEnd
4. requestchange
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Question 34 : Which of the following is an attribute to the script object?
1. onclick
2. onload
3. onshow
4. onhover
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Question 35 : Which of the following is an interface?
1. Time
2. Timing
3. Performance
4. PerformanceTiming
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Question 36 : Which of the following constants has the value 255?
1. TYPE_NAVIGATE
2. TYPE_RELOAD
3. TYPE_BACK_FORWARD
4. TYPE_RESERVED
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Question 37 : What is the command to access the Heap size limit?
1. performance.memory. SizeLimit
2. performance.memory. jsHeapSizeLimit
3. jsHeapSizeLimit
4. performance.jsHeapSizeLimit
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Question 38 : What will happen after executing the script?
1. Execute script
2. Layout positioning of DOM elements
3. Paint DOM elements
4. Build DOM nodes in render tree
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Question 39 : Which of the following API can be used to get the timing without affecting the page loading process?
1. Navigation API
2. Timing API
3. Navigation Timing API
4. None of the mentioned
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Question 40 : What is the purpose of the method localeCompare()?
1. If the reference string comes before or after another string
2. If the reference string is validated
3. If the string is a reference string
4. If the reference string comes first
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