JavaScript Set multiple values for attribute multiple values attribute magento,multiple values attribute beautifulsoup,multiple attribute

It's easy to set attribute for a given element:

el.setAttribute('rel', 'nofollow');

But for some attributes, such as rel in the example, multiple values are allowed. In case of rel, its values should be separated by space. Therefore, I cannot just setAttribute, because that would replace the existing value. What's the right way to append value to an existing attribute, so that it'll contain the both values, such as rel="external nofollow"? Is there anything better than getting the existing attribute and += the new value?

Note: Ideally, I don't want to use jQuery, just plain JavaScript.

Answer:1

I would say:

el.setAttribute("rel", el.getAttribute("rel") + " newRel");
Answer:2

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