IntersectionObserverEntry.target - Web APIs
the intersectionobserverentry interface's read-only target property indicates which targeted element has changed its amount of intersection with the intersection root.
... syntax var target = intersectionobserverentry.target; value the intersectionobserverentry's target property specifies which element previously targeted by calling intersectionobserver.observe() experienced a change in intersection with the root.
... specifications specification status comment intersection observerthe definition of 'intersectionobserverentry.target' in that specification.

IntersectionObserverEntry.time - Web APIs
the intersectionobserverentry interface's read-only time property is a domhighrestimestamp that indicates the time at which the intersection change occurred relative to the time at which the document was created.
... syntax var time = intersectionobserverentry.time; value a domhighrestimestamp which indicates the time at which the target element experienced the intersection change described by the intersectionobserverentry.
... specifications specification status comment intersection observerthe definition of 'intersectionobserverentry.time' in that specification.

Intersection Observer API - Web APIs
creating an intersection observer create the intersection observer by calling its constructor and passing it a callback function to be run whenever a threshold is crossed in one direction or the other: let options = { root: document.queryselector('#scrollarea'), rootmargin: '0px', threshold: 1.0 } let observer = new intersectionobserver(callback, options); a threshold of 1.0 means that when 100% of the target is visible within the element specified by the root option, the callback is invoked.
... intersection observer options the options object passed into the intersectionobserver() constructor let you control the circumstances under which the observer's callback is invoked.
...once you have created the observer, you need to give it a target element to watch: let target = document.queryselector('#listitem'); observer.observe(target); // the callback we setup for the observer will be executed now for the first time // it waits until we assign a target to our observer (even if the target is currently not visible) whenever the target meets a threshold specified for the intersectionobserver, the callback is invoked.
...And 17 more matches

Index - Web APIs
2178 intersection observer api api, clipping, intersection, intersection observer api, intersectionobserver, overview, performance, reference, web the intersection observer api provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or with a top-level document's viewport.
... 2180 intersectionobserver api, experimental, interface, intersection observer api, intersectionobserver, reference, observers provides a way to asynchronously observe changes in the intersection of a target element with an ancestor element or with a top-level document's viewport.
... 2181 intersectionobserver.intersectionobserver() api, constructor, intersection observer api, intersectionobserver, reference, visibility, visible the intersectionobserver() constructor creates and returns a new intersectionobserver object.
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Timing element visibility with the Intersection Observer API - Web APIs
adobserver will hold our intersectionobserver used to track the intersection between the ads and the <main> element's bounds.
...ng up to set things up, we run the startup() function below when the page loads: window.addeventlistener("load", startup, false); function startup() { contentbox = document.queryselector("main"); document.addeventlistener("visibilitychange", handlevisibilitychange, false); let observeroptions = { root: null, rootmargin: "0px", threshold: [0.0, 0.75] }; adobserver = new intersectionobserver(intersectioncallback, observeroptions); buildcontents(); refreshintervalid = window.setinterval(handlerefreshinterval, 1000); } first, a reference to the content wrapping <main> element is obtained, so we can insert our content into it.
... next we set up the options for the intersectionobserver which will monitor target elements (ads, in our case) for intersection changes relative to the document.
...And 6 more matches

Web APIs
idbindex idbindexsync idbkeyrange idblocaleawarekeyrange idbmutablefile idbobjectstore idbobjectstoresync idbopendbrequest idbrequest idbtransaction idbtransactionsync idbversionchangeevent idbversionchangerequest iirfilternode idledeadline imagebitmap imagebitmaprenderingcontext imagecapture imagedata index inputdevicecapabilities inputevent installevent installtrigger intersectionobserver intersectionobserverentry interventionreportbody k keyboard keyboardevent keyboardlayoutmap keyframeeffect keyframeeffectoptions l largestcontentfulpaint layoutshift layoutshiftattribution linearaccelerationsensor linkstyle localfilesystem localfilesystemsync localmediastream location lock lockmanager lockedfile m midiaccess midiconnectionevent midiinput midiinputmap midimess...

Progressive loading - Progressive web apps (PWAs)
here's what the relevant code looks like: if('intersectionobserver' in window) { const observer = new intersectionobserver((items, observer) => { items.foreach((item) => { if(item.isintersecting) { loadimages(item.target); observer.unobserve(item.target); } }); }); imagestoload.foreach((img) => { observer.observe(img); }); } else { imagestoload.foreach((img) => { loadimages(img); }); } if the intersectiono...