How to add text from span tag to data-attr by jQuery?

Answer 1

Your

s should have attribute title="icon"

You are using a callback to attr() function, so return the value which you need to set inside the function using .text().

$(document).ready(function () {
    $("[title='icon']").attr('data-attr', function () {
        return $(this).find('span').text();
    }).removeAttr('title');
});

Demo

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