PUBLIC MARKS from decembre with tags javascript & image

One popular method to deal with this is to “Lazy Load” the images; that is, to only load the images just before the user will need to see them. If this technique is applied to the “above the fold” content – i.e., the first average viewport-sized section of the page – then the user can get a significantly faster first view experience. So everyone should always do this, right? Given the potential limitations, let’s work on a solution that can handle all my concerns: a. works without JavaScript (i.e., lazy loading is an enhancement) b. vanilla js – no dependencies on jquery or angularjs c. works with broken JavaScript (i.e., the browser supports JavaScript, but there’s a js error somewhere which causes your script to break; might not even be your fault!)

WebPJS - Google's new image format WebP for not supported browsers (with alpha-channel)

BPG/JPEG comparison on the Lena picture [The BPG images are decoded in your browser with a small Javascript decoder. The JPEG images were compressed with mozjpeg + jpegcrush.]

There are a bunch of techniques going around for dealing with responsive images lately. That is, solutions to help us serve the right image for the occasion (e.g. size of screen and bandwidth available). They all do things a bit differently. To keep track, Christopher Schmitt and I have created this spreadsheet of techniques.

Picturefill is a JavaScript file (or a polyfill to be more specific) that enables support for the picture element and associated features in browsers that do not yet support them, so you can start using them today! Picturefill is developed and maintained by Filament Group, with help from the members of the Responsive Images Community Group and the developer community at large.

How is it different? Adaptive-Images aims to mitigate the problems inherent with Filament Group's method. It is designed to be entirely non-destructive so that it will work with any CMS or even with existing mark-up, without a need to edit anything. It creates and manages its own resized images using your existing images as the source, and it will adapt to the same resolution brackets your site does with the CSS3 @media queries used in your Responsive Design. It can do all of this because it already has the high resolution version to work on (it's the one referenced in the mark-up).

Replacing links to images is not too hard to do. However, I recommend that you keep the link but display the picture inside it. This is so you can click through if something goes wrong. For example, that sample page you gave has most of the linked images on a dead site. Other linked images only look like they point to images or might be blocked for "hot linking". To make the code robust and easy, we use jQuery and waitForKeyElements. Here is a complete working script that delinks the payload image-links on that sample site:

What is this all about? The goal of this technique is to deliver optimized, contextual image sizes for responsive layouts that utilize dramatically different image sizes at different resolutions. Ideally, this approach will allow developers to start with mobile-optimized images in their HTML and specify a larger size to be used for users with larger screen resolutions — without requesting both image sizes, and without UA sniffing.

Lazy Load is delays loading of images in long web pages. Images outside of viewport are not loaded until user scrolls to them. This is opposite of image preloading. Using Lazy Load on long web pages will make the page load faster. In some cases it can also help to reduce server load.

nous allons vous montrer comment créer les légendes des images avec diverses transitions simplement en utilisant CSS3. Simple transition effect with only CSS3.How to create image captions with various transitions simply using CSS3, dependent on transform and transition properties.

data: URI Generator The data: URI scheme allows you to build URLs that embed small data objects. data: URIs are supported by most modern browsers except for Internet Explorer. The lack of IE support is holding back widespread adoption of data: URIs, but they are still very useful in a couple of specific areas such as embedding graphics and other data items in Greasemonkey scripts. You can read more about data: URIs and see some examples of their use, or use the generator below to create your own. data: URIs are defined in RFC 2397.

Firefox = Image Zoom -> out of the box (probably not all feautures) ; try also