.wepb images test

<img src="pic.jpg" srcset="...">

Correctly converted .jpg -> .webp image
constructed by:

<?php the_post_thumbnail('full'); ?>

<img src="pic.jpg">

Correctly converted .jpg -> .webp image
constructed by:

<img src="<?php the_post_thumbnail('full'); ?>" >

<div style="background-image: url(pic.jpg)"> </div>

Failed to convert .jpg -> .webp on background of element
costructed by:

<div style="background-image: url(<?php echo the_post_thumbnail_url('full'); ?>);"> </div>

link to image URL

<a href="pic.jpg"> </a>

Failed to convert .jpg -> .webp on link
costructed by:

<a href="<?php echo the_post_thumbnail_url('full'); ?>">link</a>