Bootstrap Modal data attributes

bootstrap-modal.htm

h2. My Observation on Bootstrap Modal data attributes
=======

I have added to data-* attributes for Modal window to pass data on to display.
Data attributes are- 
#data-fyid 
#data-fyHead

In the JavaScript code-
`
$('#fy_modal').on('show.bs.modal', function (event) {
  let button = $(event.relatedTarget) // Button that triggered the modal
  let fyid = button.data('fyid') // This give me the actual integer ID in modal
  // let fyhead = button.data('fyHead'); // This will return value as undefined
  let fyhead = button.data('fyhead'); // This will return correct value
  ....
});
`

So to get the value for **data-fyHead** attribute, I have to chage the case of the variable to **data-fyhead**, this solve my problem.
I learn that camelcase is not supported in Bootstrap modal to pass data via attributes.