css - Why string assignment in javaScript is case insensitive? -

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I have created simple HTML pages with a button, when its color changes when clicked: 

  & lt ;! DOCTYPE html & gt; & Lt; Html & gt; & Lt; Top & gt; & Lt; Title & gt; & Lt; / Title & gt; & Lt; / Head & gt; & Lt; Body & gt; & Lt; Button onclick = "if (this.style.backgroundColor == 'red') {this.style.backgroundColor = 'green'} else {this.style.backgroundColor = 'Red'} alert (this.style.backgroundColor)" & Gt; Ok & lt; / Button & gt; & Lt; / Body & gt; & Lt; / Html & gt;   
 It is surprising to me that  is the warning (this.style.backgroundColor) instead of  red   red .  Why?  An assignment is  this.style.backgroundColor = 'Red'  and starts with capitalization in  Red .   
 
 
 CSS styles have not been saved as a literal string, they are in the internal, Are changed. Color styles are case-insensitive, and the canonical representation is lowercase.

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