H tags vs css style seo?

Many are using H1 and H2 tags despite their downside. I am wondering what if I use CSS style font-size instead of H tags what difference would that make?

In SEO which is better H tag or CSS style?

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Basically, Search engines loves & provides the importance to H tags then the fashion <font> tags. Google pays attention to the keywords in H tags not to the css font styles. Also CSS files takes bit more executing time than the HTML tags.

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If H1 tag is so good for SEO how many can I have on the page? How about the website how many H1 tags can the website have?

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Mattcutts says, You can have multiple H1 tags in a page.
But up to me, one H1 is better, two H1 tags are good, Multiple H1 tags a bad idea.

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Thanks @KevinMax I didn't realize H1 tags plays such an important role in SEO. Will use it from now one.

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