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What is the purpose of script loading?

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What is the purpose of script loading?

(a) Load Scripts programmatically

(b) Load JavaScript files manually

(c) Load JavaScript files programmatically

(d) Load Scripts programmatically & manually

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This interesting question is from Script Loading topic in section Invocation and Performance Navigation of JavaScript

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The correct choice is (c) Load JavaScript files programmatically

Easy explanation: The script loading loads remote JavaScript files programmatically and allow us to trick the rendering engine. The async attribute is a boolean attribute. When present, it specifies that the script will be executed asynchronously as soon as it is available.

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