H2 comes before h1 in source Is it ok

Question

IF i use <h2> for left sidebar heading and use <h1> for main center content area heading then actually in source and and if CSS is disabled , in both condition <h2> comes before <h1>.
Is it ok? or I should not use <h2> for left sidebar headings?

Answer 1

Semantically, H1 should come before H2 in a document. H2 is a sub-element of H1.
I would suggest you to use the following markup:

<h1><a>Main title of your site</a></h1>
<h2>Sidebar</h2>
    <h3>Sidebar Headline 1</h3>
    <h3>Sidebar Headline 2</h3>
    .... 
<h2>Main content</h2>
    <h3>Headline 1</h3>
    <h3>Headline 2</h3>
    ...

Note: The best way is to have the sidebar after the content in your HTML and use CSS to position it where you want.