Get table headings to use with responsive table layout and exclude wp-block-table is-style-stripes

responsive-table.js

/* Credits:
	This bit of code: Exis | exisweb.net/responsive-tables-in-wordpress
	Original idea: Dudley Storey | codepen.io/dudleystorey/pen/Geprd */
  
var headertext = [];
var headers = document.querySelectorAll("table:not(.is-style-stripes) thead");
var tablebody = document.querySelectorAll("table:not(.is-style-stripes) tbody");

for (var i = 0; i < headers.length; i++) {
	headertext[i]=[];
	for (var j = 0, headrow; headrow = headers[i].rows[0].cells[j]; j++) {
	  var current = headrow;
	  headertext[i].push(current.textContent);
	  }
} 

for (var h = 0, tbody; tbody = tablebody[h]; h++) {
	for (var i = 0, row; row = tbody.rows[i]; i++) {
	  for (var j = 0, col; col = row.cells[j]; j++) {
	    col.setAttribute("data-th", headertext[h][j]);
	  } 
	}
}