Web Reference: Mar 23, 2026 · The setAttribute () method of the Element interface sets the value of an attribute on the specified element. If the attribute already exists, the value is updated; otherwise a new attribute is added with the specified name and value. Description The setAttribute() method sets a new value to an attribute. If the attribute does not exist, it is created first. If the element you are referring to does not already include a Javascript object property for a given attribute (as others have described), then setting that property will not propagate the change back to the DOM, it just adds the named property to the Javascript object, and the DOM ignores it.
YouTube Excerpt: This video discusses the relationship between the attributes in HTML and the properties in
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