Blogger Conditional Tag

Archive page

<b:if cond='data:blog.pageType == "archive"'>
<!--archive_Page-->
</b:if>

Error Page (404)

<b:if cond='data:blog.pageType == "error_page"'>
<!-- all error pages-->
</b:if>

Index Page

<b:if cond='data:blog.pageType == "index"'>
<!-- all index pages -->
</b:if>

Homepage

<b:if cond='data:blog.url == data:blog.homepageUrl'> 
<!-- only homepage -->
</b:if>

Item (post) pages

<b:if cond='data:blog.pageType == "item"'>
<!-- all item pages -->
</b:if>

Specific Post by URL

<b:if cond='data:blog.url == data:blog.canonicalHomepageUrl + "2014/08/foo.html"'> 
<!-- a item page from august 2014 with post-title 'foo'-->
</b:if>

Label page

<b:if cond='data:blog.searchLabel'>
<!-- all label pages -->
</b:if>

Specific Label Page

<b:if cond='data:blog.searchLabel == "foo"'>
<!-- for label 'foo' -->
</b:if>

Search page

<b:if cond='data:blog.searchQuery'>
<!-- all search pages -->
</b:if>

Specific Search Query page

<b:if cond='data:blog.searchQuery == "foo"'>
<!-- for query 'foo' -->
</b:if>

Static page

<b:if cond='data:blog.pageType == "static_page"'>
<!-- all static pages -->
</b:if>

Specific Static page by URL

<b:if cond='data:blog.url == data:blog.canonicalHomepageUrl + "p/foo.html"'> 
<!-- a specific static page with name 'foo' -->
</b:if>

AND/OR/NOT

AND

<b:if cond='data:blog.pageType == "index"'>
<b:if cond='data:blog.searchQuery'>
<!--search_page AND index_page-->
</b:if>
</b:if>

OR

<b:if cond='data:blog.url == data:blog.canonicalHomepageUrl + "p/foo.html"'> 
<!-- static_site foo OR static_site bar -->
<b:else/>
<b:if cond='data:blog.url == data:blog.canonicalHomepageUrl + "p/bar.htm"'> 
<!-- static_site foo OR static_site bar -->
</b:if>
</b:if>

NOT

<b:if cond='data:blog.pageType != "item"'>
<!-- all pages except item pages -->
</b:if>

<b:if cond='data:blog.url != data:blog.homepageUrl'> 
<!-- all pages but NOT homepage -->
</b:if>

Conditional Inside Section

<b:section class='below-post' cond='data:blog.pageType == "item"' id='below-post' maxwidgets='' showaddelement='yes'></b:section>