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To change HTML span classes to @data-id, you need to modify the HTML code as follows:
original code:
<span class="my-class">Hello World!</span>
modified code with @data-id:
<span data-id="my-class">Hello World!</span>
In this case, the "class" attribute has been replaced by "data-id" attribute, and the original class name "my-class" has been moved to the value of the "data-id" attribute.