Hey can you tell me why anyone would link CSS files with import directives? What's the source for 2 , and if it's true, can you then explain why on occasion a page will finish loading the content, then the CSS is applied a second or two later?
Will it always work as expected? Show 2 more comments. It also works better as jQuery states "When using scripts that rely on the value of CSS style properties, it's important to reference external stylesheets or embed style elements before referencing the scripts". How would you go about guaranteeing all the css was loaded before the javascript executes?
Can you? Jonnio If your JS has a dependency, then you should make that dependency explicit. Otherwise, you will always have rare timing issues.
ES6 modules are a good way to make that happen, but there are many libraries that could be used as well. Add a comment. I appreciate the point you are making in bold, but the OP is talking about what happens when you vary the order with both at the top, neither at the bottom. Thus, "assuming [his] test is valid.
I include CSS files before Javascript for a different reason. I am not guessing. In retrospect, I guess the important things are just to avoid dynamic loading of CSS and putting the JS inside a domReady event if you need to do dynamic sizing — hugomg. Scripts should should not change any display. That's the CSS job. Also js should only act after or while the DOMContentLoaded is fired with some little but very specific situations. But I understand what you mean. Stupid IE! Show 1 more comment.
Know your users and what they value. Know your users and what browsing environment they use. Know what each file does, and what its pre-requisites are. Making everything work will take precedence over both speed and pretty. Use tools that show you the network time line when developing. Test in each of the environments that your users use. It may be needed to dynamically server side, when creating the page alter the order of loading based on the users environment.
When in doubt, alter the order and measure again. It is possible that intermixing styles and scripts in the load order will be optimal; not all of one then all of the other. Experiment not just what order to load the files but where. In Body? After Body? Consider async and defer options when appropriate to reduce the net delay the user will experience before being able to interact with the page.
Test to determine if they help or hurt. There will always be trade offs to consider when evaluating the optimal load order. Pretty vs. Responsive being just one. Ted Cohen Ted Cohen 9 9 silver badges 16 16 bronze badges. The linked article no longer claims "Stylesheet loads block script execution".
Is that no longer true? Greg - It's still true. Scripts need to be able to query DOM. They might not block script loading , if they're smart, but they will block script. Updated I was not sure about the tests in OP. Salman A Salman A k 78 78 gold badges silver badges bronze badges. That's also why document. The reason is that the script may want to get coordinates and other style-dependent properties of elements, like in the example above.
Naturally, it has to wait for styles to load. Doesn't make much sense to me, order of executed JS doesn't tell anything about it's purpose. However consider this One page on your site is 50k which is not unreasonable. Its a small optimization but thats the reason for it. You are also, apparently, unaware of the fact that they now use a CDN. It should be a small script just for the purpose for reading session and then setting the style either css variables or other means based on the user session.
This prevents a flash of rendering default style before the script switches to set style. The answer: it probably doesn't matter The best answer here was from , so I decided to test for myself. Steve Souders has already given a definitive answer but I wonder whether there's an issue with both Sam's original test and Josh's repeat of it. Andy Davies Andy Davies 5, 2 2 gold badges 24 24 silver badges 21 21 bronze badges.
If you look at this waterfall you can see where Chrome speculatively opens up a second connection before it's needed webpagetest. I was thinking normal latency for TCP purposes rather than low - what sort of environment was the test done in? Re: "Steve Souders has already given a definitive answer but The actual correct semantic should actually have been for Steve to say "Put CSS before Synchronous JavaScript" Otherwise people get it wrong by generalizing as it being a rule for all scripts Yes but most people just include scripts synchronously so Steve's advice is good to the uninitiated.
Consider for the same case, Instead of having single css, take 2 or 3 css files and try it out these ways, 1 css.. George Katsanos George Katsanos Performance is always an issue. I just almost ignore that browsers that do not follow the spec exist. I just prepare my code such that the ones that follow the spec work at full speed and the others i just do such that it works.
So, for example, if it just works in IE8, all ok. The Overflow Blog. Podcast Who is building clouds for the independent developer? Exploding turkeys and how not to thaw your frozen bird: Top turkey questions Featured on Meta. Yeah, I found out that my information was on the dark web because the Avast user database was hacked. Thanks Avast, now that's 1st class security for ya. You guys can't even protect yourselves and your users.
How can we ever trust your program to protect us? While we may agree on data sharing thing they were doing, there is a lot of nonsense in this thread beyond that.
There is uninstaller and if it fails for whatever reason, there is avast! Uninstall Utility that has worked on every instance. Preferably in Safe mode where it has a greater reach and capability. If even that fails for whatever reason, we're here and we've done guides or tools to do cleanup as well as tech support from avast! So, saying you can't get rid of it is disingenuous screeching in a wake of another unrelated drama.
Visit my webpage Angry Sheep Blog. Dunno, when done in Safe Mode, it always removed it. Only thing that did and still bothers me is that it doesn't clean everything and still keeps some crap around. It also uses filters to completely remove web bugs, tracking scripts, and other information collectors from the sites you visit. Anti-Tracking is enabled by default. Privacy Cleaner clears your browsing history as well as other data stored in your browsers, such as cached images and cookies.
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