javascript - I want to add timer control in my online examination project -

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I want to make timer controls for my online exam's website 

    
  
 I want to make a timer control for my website of the online exam, as the code is above. And for me, my written javascript has been written, but the bitmaker   
 
 
 You have an error here  wrong ID < / Strong>:  
  document.getElementById ("lblCtime.ClientID"). WinnerHTML = h + ":" + m + ":" + s; ^ << Code>  
 Error:  
  Unkit type error: can not set property 'internal HTML' blank   
 Try this code:  
  document.getElementById ("lblCtime"). InnerHTML = h + ":" + m + ":" + s;

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