Lofesa commented on issue #1893: Lazyload filter not working URL: https://github.com/apache/incubator-pagespeed-mod/issues/1893#issuecomment-496385978 Hi The onload is an event in the browser side, like on scroll or on click, and is fired when all elements (html,css,js,,,) on a page are loaded. With these url parameters you can change the config of the pagespeed module for these request, you can enable or disabe filters, even disable pagespeed module (?PageSpeed=off) so you don´t need to change the conf file to see how a filter work in a request. A beacon is a javascript snipet that is injected in the page by pagespeed, this snipet return to the server info about the image (Is the image in the viewport? What size have the image rendered?...) . For example if you use ModPagespeedEnableFilters resize_rendered_image_dimensions the module must know what dimensions the image has when rendered to shrinks the image to these dimensions. This can be enabled with: ModPagespeedCriticalImagesBeaconEnabled true
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