It lets you track specific parts of a website in a similar manner to web slices. Fireclipįireclip is a Firefox addon that lets you "clip out" parts of a website and watch them for changes. With Greasemonkey, WebChunks can insert webchunks or webslices markup into any web page so the Webchunks extension handles it. ![]() It allows you to "follow" an area of a web page through a dedicated feed bookmarked in a new toolbar. WebChunks is a Mozilla Firefox 3 implementation of Microsoft Webslices. While Firefox does not have built in support for web slices, extensions have been created to give the ability to read web slices. Title goes here ="ttl" style="display:none">360 The content goes here Support Mozilla Firefox To disable Web Slices on a web page, add: The 3 required properties are: the Web Slice id, entry title, and entry content. ContentsĪ Web Slice has 9 properties: the Web Slice id, entry title, entry content, end time, alternative display source, alternative navigation, alternative update source, and time to live. As of 2012, , Internet Explorer 8 and 9 were the only browsers to support Web Slices natively, although Mozilla Firefox had support via an add-on called webchunks. Introduced in Internet Explorer 8 Beta 1, Web Slices can be previewed in a fly-out window. The specification is not published by any independent standards body. Microsoft developed the Web Slice format, and published a specification under their Open Specification Promise. Web Slices are a web feed technology based on the hAtom Microformat that allows users to subscribe to portions of a web page. Web Slice Format Specification - Version 0.9 Yes, As part of Microsoft Open Specification Promise Now let's see how to use Intersection Observer in JavaScript to lazy-load images using this markup pattern: document. The data-src and data-srcset attributes, which are placeholder attributes containing the URL for the image you'll load once the element is in the viewport.The src attribute, which references a placeholder image that will appear when the page first loads.The class attribute, which is what you'll select the element with in JavaScript.There are three relevant pieces of this markup that you should focus on: Let's assume this basic markup pattern for your lazily loaded elements: All that's left to do is to decide what to do when an element is visible. Intersection Observer is easier to use and read than code relying on various event handlers, because you only need to register an observer to watch elements rather than writing tedious element visibility detection code. While this approach is the most compatible across browsers, modern browsers offer a more performant and efficient way to do the work of checking element visibility via the Intersection Observer API. If you've written lazy loading code before, you may have accomplished your task by using event handlers such as scroll or resize. ![]() If they are, their src (and sometimes srcset) attributes are populated with URLs to the desired image content. To polyfill lazy loading of elements, we use JavaScript to check if they're in the viewport. To learn more, check out Browser-level lazy loading for the web. If you have large numbers of images and want to be sure that users of browsers without support for lazy loading benefit you will need to combine this with one of the methods explained next. If the browser does not support lazy loading then the attribute will be ignored and images will load immediately, as normal.įor most websites, adding this attribute to inline images will be a performance boost and save users loading images that they may not ever scroll to. See the loading field of MDN's browser compatibility table for details of browser support. We suggest not to lazy-load iframes using the loading attribute until it becomes part of the specification. While implemented in Chromium, it does not yet have a specification and is subject to future change when this does happen.
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