added enhancement in dialog project(HTML/JS)

[kattasahan]

Title and Issue number

Title : Vanilla: Dialog - Enhance the features

Issue No. :

Code Stack : Vanilla JS

Close #<issue_no>

Checklist:

• [] I have mentioned the issue number in my Pull Request.
• I have commented my code, particularly in hard-to-understand areas
• [] I have created a helpful and easy to understand README.md
• [] I have updated the Index.html file for my contribution

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