const span = [...document.querySelectorAll('span')];
span.forEach(function (span) {
if (span.className.indexOf('unwanted-span') !== -1) {
span.parentNode.removeChild(span);
}
});
I have just seen that you want to remove just the data-tag, there are many ways to do that. The above is a function that will let you do anything with the 'unwanted' spans.