Is there a single universal way to load all assets before using them? I am wanting to load some images, audio files, and a few .swf
files before my app starts. Currently, I load the images by creating new <img>
elements and setting the src
to the image path, for the audio files I add the preload="auto"
attribute in the <audio>
tag and I perform an ajax
request to load the .swf
s.
Is there any problem (re some browsers not caching etc.) with the way I am currently loading my files and is there a 'best practices' way of collectively preloading all these file types before I display my content?
preload is a program written by Behdad Esfahbod which runs as a daemon and records statistics about usage of programs using Markov chains; files of more frequently-used programs are, during a computer's spare time, loaded into memory. This results in faster startup times as less data needs to be fetched from disk.
To improve running accuracy by reducing runout of shaft, as well as to heighten position accuracy in radial and axial directions. To improve gear engagement accuracy by increasing bearing rigidity.
To check whether preloading has any influence on performance, you should have a look at times and the order of the resources being loaded within the DevTools Network Monitor. Having said that, preloading actually does not work in Firefox yet (as of version 68).
The browser assigns a higher priority level to the resource and tries to download it sooner while not delaying the window. onload event. Preload resources by adding a <link> tag with rel="preload" to the head of your HTML document. Use as to specify the type of content to be preloaded.
Yes. Actually, this has been made into a standard. Here is the relevant RFC. A move to standardise this for HTML5 is in works
Most modern browsers support prefetching. Here is a brief summary of how they are used:
As per MDN, you can use the <link>
tags in head of the document,
<link rel="prefetch" href="/assets/my-preloaded-image.png">
as well as set HTTP Link
header with the request, or within the HTML as a meta
tag.
Link: </assets/my-preloaded-image.png>; rel=prefetch <meta http-equiv="Link" content="</assets/my-preloaded-image.png>; rel=prefetch"> enter code here
Not only this, but you can also give navigation hints within the page, such as what will be the next page, etc.
<link rel="next" href="2.html">
In Internet Explorer too there is the Prefetch header. You can set like so:
<link rel="prefetch" href="http://example.com/style.css" />
You can even prefetch (pre-resolve) DNS queries
<link rel="dns-prefetch" href="http://example.com/"/>
Or, prerender a web page (a-la Google Instant)
<link rel="prerender" href="http://example.com/nextpage.html" />
Chrome also does the same things as Firefox and IE in this regard.
I have not been able to find solid proof of whether Safari supports these things. But reading up on many sources, I suspect they do, just that probably Apple is not so eager to market Safari as Microsoft is pushing IE11 (just an opinion).
Have fun. :)
Update: After compiling this answer, I stumbled upon a similar answer on SO, which gives more details on the topic. Please do have a look.
How can I preload a page using HTML5?
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