Thẻ b:attr blogspot là gì và cách sử dụng

The b:attr tag, or the attribute tag, is a tag for simplifying adding an attribute to the parent element, especially conditionally.
Attributes

name - Name of the attribute.

value - Value of the attribute.

cond - Boolean expression for whether to append the attribute

Example usage

<div> <b:attr name='data-foo' value='data:blog.blogId' cond='data:view.isHomepage' /> </div>

On homepages, this would produce

<div data-foo='123456789012'> </div>

On other pages, this would produce

<div> </div>

If get id post use expr:value

<b:attr cond='data:view.isMultipleItems' expr:value='data:post.id' name='data-id'/>