The tabs kept the favicon, but became "Untitled", and when you clicked on them, they were just blank, and the "back" button was disabled. Just weeks ago, Safari lost me a few tabs, twice. That's not the case when it comes to the user experience, where Safari still lags far behind. I can't speak to Safari's dev tools because I just use Chrome's.īut if critics keep focusing on webcompat, they might comfort the WebKit team into thinking that all the criticism is unwarranted, and that Safari has caugh up. Though I'll note that much of the criticism (see: IndexedDB) wasn't Apple lacking standards support, but having buggy implementations. It's true that WebKit is no longer lagging behind web standards (with the notable exceptions of PWAs and prefetch). It seems the criticism on Safari hasn't evolved alongside WebKit's efforts. It’s not a big deal if you can’t get to it right away.” There are other directives that are hints or suggestions, kind of like saying to the browser “if you’re not too busy and you have the bandwidth available, could you download this resource? I don’t need it for the current page but there’s a good chance I’ll need it for the next page the user is likely to access next. The browser is not free to “ignore the request”, which would defeat the purpose of having a directive that tells the browser you want a particular resource to jump to the head of the download queue. I know you’re not aware of this resource because you haven’t parsed that section of the HTML or CSS yet, but trust me, I need you to start downloading it right now.” The point of preload is to tell the browser “hey-I know you’re busy but this resource is really important for the current page and I need you to prioritize downloading it. Ī user agent must not delay the load event for this link type. The preload keyword indicates that the user agent will preemptively fetch and cache the specified resource according to the potential destination given by the as attribute (and the priority associated with the corresponding destination), as it is highly likely that the user will require this resource for the current navigation. That’s not the way the spec is written for rel=preload. No, it's a statement that a correct implementation of preloading is free ignore any of your requests. If you need resources from several different non-origin servers, the amount of time for DNS lookups and TLS handshakes starts to add up.Ģ. If your resources are on servers that aren’t your origin (like a CDN) but you don’t need them yet, you can use rel=preconnect, which does the DNS lookup and the TLS handshake in the background, so when it’s time to download from the CDN, you’re not delayed by the DNS lookup and the TLS handshake, because it’s already done. When the user navigates to the next page, all of your important resources are in the cache and can be used immediately. If you need something for the next navigation-say your homepage is splash page and you want a nearly instantaneous transition to the next page-that’s when you would use prefetch. If you preload something and you don’t use it, that bandwidth could have been used to download something you do use. However, preloading something then not using it is a waste of bandwidth and possibly screws up the priority of how resources load. If the resource doesn’t get used on the current navigation, it stays in the cache, because you said you needed the resource. The point of using rel=preload is because you want to start downloading a resource before it’s discovered in your HTML or CSS for the current navigation. I might be mistaken but I was under the impression that if you PRELOAD an asset, and that asset is not actually used on the page in which preloaded it - then that asset doesn't get cached for use on a future page. You can block 3rd party cookies in Firefox, see Disabling third party cookies.) (For example, if you google amazon, the Google results page will prefetch causing amazon cookies to be sent back and forth. Privacy implications Along with the referral and URL-following implications already mentioned above, prefetching will generally cause the cookies of the prefetched site to be accessed. Users who don’t have unlimited cellular data and pay by the megabyte probably don’t want the browser downloading stuff in the background they didn’t ask for and may not need.Ĥ. If the browser is wrong, there’s no benefit.ģ. If it guesses correctly, the next navigation is fast, because the page and its resources, (assuming they have rel=prefetch assigned to them) is already in the cache. prefetch is a browser hint during browser idle time, using some heuristic, it downloads resources in the background it thinks you might need or pages you might navigate to next. prefetch has no role regarding initial page load, which is the thing most people care about most not supporting it has no effect on that.Ģ. Still no prefetch to help websites load faster :(ġ.
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