<p>Hey, <mark>this is important!</mark></p>

Hey, ==this is important\!==

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<!DOCTYPE document SYSTEM "CommonMark.dtd">
<document xmlns="http://commonmark.org/xml/1.0">
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      <text xml:space="preserve">this is important!</text>
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<p>This is <mark>important!</mark>.</p>
<p>This is <mark>very important</mark> OK?</p>
<p><mark>It is a
shrubbery</mark></p>
<p>Vendo <mark>Opel Corsa <strong>em bom estado</strong></mark></p>
<p>Ceci n'est pas =important=</p>

This is ==important\!==.

This is ==very important== OK?

==It is a
shrubbery==

Vendo ==Opel Corsa **em bom estado**==

Ceci n'est pas =important=

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