![]() Doing it in one place makes lots of nice things on the web work a lot simpler than if there was more parallelisation. What's that you say? What's the difference? Well the main thread is where all the critical stuff happens in browsers - all your JavaScript, and also lots of browser processing to layout the page and stuff. because even if it won't block the main thread itself, it might block rendering. However, it might appear like you will block the main thread. Maybe this wasn't the case when the attribute was originally proposed (in which case it would have been more important than it was now), I'm not sure, but browser engineers tell me it's definitely not the case now. So, in theory, you are not going to free up the main thread with this attribute. And any older, or more simpler, browsers out there that do still decode on the main thread are almost certainly not going to support this attribute. Modern browsers all decode images off the main thread, and have done so for a while now, leaving it free for other stuff. No, browsers don't decode images on the main thread Hopefully this post will displace that if I pray to the SEO Gods enough. I'm not going to link to the article I pulled this example from, but it's the first one that comes up when you search for "what does decoding=async do" so that's depressing. Seriously, that's just not how browsers work! How many times have you seen a page load without images being there yet? Loads of times right? Images are not typically render-blocking and if they were the web would be a very slow and painful place to be. The bottom paragraph will not be shown until the image is loaded and decoded, and that setting decoding=async will magically prevent that delay: Text with very important info for the user No, images in your HTML are not rendering-blocking and you don't need to add this magic attribute to make the stuff below images load. Some misconceptionsįirst up let's get some misconceptions out of the way, that I see all the time about this attribute: No, images do not block rendering of contents that follow it Well recently I ranted on Twitter about this (as I am often want to do!) in a long thread that really should have been a blog post. ![]() But what does this actually mean in real life? Which setting should you use? Does it even matter? And if it does, why don't those clever browser engineers just set it to the best setting? Indicates no preference in decoding mode (the default).Įrr. Indicates a preference to decode this image asynchronously to avoid delaying presentation of other content. ![]() Perfection is achieved not when there is nothing more to add, but rather when there is nothing more to take away.Indicates a preference to decode this image synchronously for atomic presentation with other content. The character "%" is allowed but is interpreted as the start of a special escaped sequence. It is assumed that all characters in the encoded string are one of the following: "a" through "z", "A" through "Z", "0" through "9", and "-", "_", ".", and "*". The conversion process is the reverse of that used by the URLEncoder. URL decoding replaces characters with a "%" followed by two hexadecimal digits to the respective ASCII letter. This is a simple tool that will help you decode a URL that can be safely used for links. Plus symbols ('+') are decoded to a space character. URL encoded text is most commonly used in web addresses for passing URLs in querystring variables.Įncodes or decodes a string so that it conforms to the the Uniform Resource Locators Specification - URL (RFC 1738).ĭecodes any %# encoding in the given string. This is a simple tool that will help you decode text that can be safely put into URL query string values known as GET variables into readable text. This is useful when you want to view and understand the special characters in a URL parameter. URL Query String Decoder Tool is a Free SEO Tool allows to Decode a query string parameters that has been url encoded.
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