# Lazy load với owl.carousel.js (ok)
```
Document
```
**Ví dụ 1: Áp dụng với tag img**
C:\xampp\htdocs\wordpress3\wp-content\themes\twentytwentyone\template-parts\header\excerpt-header.php
```
```
C:\xampp\htdocs\wordpress3\wp-content\themes\twentytwentyone\inc\template-tags.php
```
function twenty_twenty_one_post_thumbnail() {
$thumbnail_id = get_post_thumbnail_id( get_the_ID() );
$thumbnail_srcset = wp_get_attachment_image_srcset( $thumbnail_id, 'full' );
$thumbnail_sizes = wp_get_attachment_image_sizes( $thumbnail_id, 'full' );
$thumbnail_attachment = wp_get_attachment_image_src( $thumbnail_id, 'full' );
$thumbnail_url = get_the_post_thumbnail_url( get_the_ID(), 'full' );
$bottom_padding = 100;
if( $thumbnail_attachment[1] > 0 ) {
$bottom_padding = ($thumbnail_attachment[2]/$thumbnail_attachment[1]) * 100;
}
?>
0 ) {
$bottom_padding = ($thumbnail_attachment[2]/$thumbnail_attachment[1]) * 100;
}
?>
```
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