Sử dụng 1 trong 2 đoạn code dưới đây
Code 1
<!-- Blogger có thumbnail nguồn blogspot -->
<b:if cond='data:post.isFirstPost == "true"'>
<b:if cond='data:post.thumbnailUrl'>
<img expr:alt='data:post.title' expr:src='data:post.thumbnailUrl' height='72' width='72'/>
<b:else/>
<img expr:alt='data:post.title' height='72' src='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJmI-2tTN840LADpzglpbP3W5pZ51bpU3VBtlBXW6t-WstlRpopts_iVSxwSyQPYfUkS8dZqjKHDhCgNi7rWpuho3dwH8YtUHRdj0MeU_ddJiWWtTxqe-lZa6G_4OPyrddvOcgH1XRUvKI//' width='72'/>
</b:if></b:if>
Code 2
<!-- Blogger có thumbnail nguồn ngoài -->
<b:if cond='data:post.isFirstPost == "true"'>
<b:if cond='data:post.firstImageUrl'>
<img expr:alt='data:post.title' expr:src='data:post.firstImageUrl' height='72' width='72'/>
<b:else/>
<img expr:alt='data:post.title' height='72' src='https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiJmI-2tTN840LADpzglpbP3W5pZ51bpU3VBtlBXW6t-WstlRpopts_iVSxwSyQPYfUkS8dZqjKHDhCgNi7rWpuho3dwH8YtUHRdj0MeU_ddJiWWtTxqe-lZa6G_4OPyrddvOcgH1XRUvKI//' width='72'/>
</b:if></b:if>