'What is the function of this code in thumbnails: quot

What is the meaning of this code please? "300:100&quot


The code is in this line:

<a expr:href='data:post.url'><img expr:alt='data:post.title' expr:src='resizeImage(data:post.firstImageUrl, 16000, &quot;300:100&quot;)' expr:title='data:post.title'/>
</a>


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Source: Stack Overflow

Solution Source