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toUpperCase() method in JavaScript

JavaScript String toUpperCase() method : The toUpperCase() method is used to convert the string to the upper case. It returns the new string as in upper case letters. It doesn't change the original ...
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index.md

The toUpperCase() method of {{jsxref("String")}} values returns this string converted to uppercase. The toUpperCase() method returns the value of the string converted to uppercase. This method does ...
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TypeError: tagName.toUpperCase is not a function

TypeError: tagName.toUpperCase is not a function #365 Closed Zorig opened on Mar 23, 2017 ...