Add upstream

wp-content/plugins/jetpack/modules/lazy-images.php

@@ -0,0 +1,39 @@
+<?php
+
+/**
+ * Module Name: Lazy Images
+ * Module Description: Speed up your site and create a smoother viewing experience by loading images as visitors scroll down the screen, instead of all at once.
+ * Sort Order: 24
+ * Recommendation Order: 14
+ * First Introduced: 5.6.0
+ * Requires Connection: No
+ * Auto Activate: No
+ * Module Tags: Appearance, Recommended
+ * Feature: Appearance
+ * Additional Search Queries: mobile, theme, fast images, fast image, image, lazy, lazy load, lazyload, images, lazy images, thumbnail, image lazy load, lazy loading, load, loading
+ */
+
+/**
+ * This module relies heavily upon the Lazy Load plugin which was worked on by
+ * Mohammad Jangda (batmoo), the WordPress.com VIP team, the TechCrunch 2011
+ * redesign team, and Jake Goldman of 10up LLC.
+ *
+ * The JavaScript has been updated to rely on InterSection observer instead of
+ * jQuery Sonar. Many thanks to Dean Hume (deanhume) and his example:
+ * https://github.com/deanhume/lazy-observer-load
+ */
+
+require_once( JETPACK__PLUGIN_DIR . 'modules/lazy-images/lazy-images.php' );
+
+/*
+ * Initialize lazy images on the wp action so that conditional
+ * tags are safe to use.
+ *
+ * As an example, this is important if a theme wants to disable lazy images except
+ * on single posts, pages, or attachments by short-circuiting lazy images when
+ * is_singular() returns false.
+ *
+ * See: https://github.com/Automattic/jetpack/issues/8888
+ */
+
+add_action( 'wp', array( 'Jetpack_Lazy_Images', 'instance' ) );