People (especially those that use WordPress and themes) will often put whole paragraphs of text inside of a h* because their theme doesn't use classes to manipulate CSS properties, but relies on attaching those CSS properties via the h* selectors.
Meaning, for example that h1 is big and blue, while h3 is a bit smaller and yellow. So someone comes along and says "this bit of text [imagine a long sentance]" needs to be a bit larger and yellow, and they will then proceed to put that very long text (which obviously is not a heading) inside a h3 tag, just for the looks.
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Same question here
Headings should be used to define hierarchy in your webpage, and should never be used for styling purposes.
People (especially those that use WordPress and themes) will often put whole paragraphs of text inside of a h* because their theme doesn't use classes to manipulate CSS properties, but relies on attaching those CSS properties via the h* selectors.
Meaning, for example that h1 is big and blue, while h3 is a bit smaller and yellow. So someone comes along and says "this bit of text [imagine a long sentance]" needs to be a bit larger and yellow, and they will then proceed to put that very long text (which obviously is not a heading) inside a h3 tag, just for the looks.