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How to access HTML elements values in JS code for Lightning Web Component (LWC)?

Here, we will create a button with two arguments (Username and Email) and we will get these arguments in JS code.

HTML Code:

<lightning-button label="Button" title="Button" data-username={username} data-name={policyList.boxId} onclick={jsfunction}>

JavaScript Code:

jsfunction(event) {
let username =;
let name =;
console.log('UserName: '+username);
console.log(‘Name: '+name);

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