The tag <b:tag> is an instruction tag to give tag in HTML page. Does not look promising, but if we combine with some condition, then we can make it into different HTML tag with a single <b:tag>.

<b:tag> Syntax and Attribute

Blogger XML Language
<b:tag  cond='EXPRESSION' 
        HTML-ATTRIBUTE='STRING'
        name='STRING'>
 
</b:tag>
  • Not like <b:attr> and <b:class> tags, The <b:tag> can give direct HTML Attribute to the tag.
  • Multiple different HTML-ATTRIBUTE can be used in a single <b:tag>.
  • Both HTML-ATTRIBUTE and name can be used with expr: attribute which give another 'EXPRESSION'.

<b:tag> Examples and Implementation

Normal operation
<b:tag name='div'>
 
</b:tag>
The tag will generate an HTML div tag.
Result
<div>
 
</div>
Add a tag with a condition and extra HTML attribute.
<b:tag cond='data:view.isHomepage' id='foo' class='bar' name='div'>
 
</b:tag>
The new tag div with id 'foo' and class 'bar' will be added in HTML rendering only if the current page is the home page.
Result
<div id='foo' class='bar'>
 
</div>
With ternary operation
<b:tag expr:name='data:view.isHomepage ? "div" : "span"'>
 
</b:tag>
The new <div> will be added if the current page is the homepage. Otherwise, the new tag will be <span> in HTML rendering.
Working with link
<b:tag title='Hi There' expr:class='data:view.isPost ? "foo" : "bar"' expr:href='data:blog.homepageUrl' name='a'>
  <h1>Hello Word</h1>
</b:tag>
<a> Tag with Blog URL and 'Hi There' as title will be added, and if the current view posts he will get 'foo' class, otherwise he got 'bar' class.


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