What are triggers and how do you invoke a trigger on demand? give one reference with your anwer.

New Perspectives on HTML5, CSS3, and JavaScript
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ISBN:9781305503922
Author:Patrick M. Carey
Publisher:Patrick M. Carey
Chapter9: Getting Started With Javascript: Creating A Countdown Clock
Section9.3: Visual Overview: Javascript Functions And Expressions
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What are triggers and how do you invoke a trigger on demand? give one reference with your anwer.

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