Let's examine a typical scenario. A typical website may contain a header image and some content images below the header. The header image will likely span the whole of the width of the header, and the content image will fit somewhere inside the content column. Here's a simple example:. This works well on a wide screen device, such as a laptop or desktop you can see the example live and find the source code on GitHub.
We won't discuss the CSS much in this lesson, except to say that:. However, issues arise when you start to view the site on a narrow screen device. The header below looks OK, but it's starting to take up a lot of the screen height for a mobile device. And at this size, it is difficult to see faces of the two people within the first content image. An improvement would be to display a cropped version of the image which displays the important details of the image when the site is viewed on a narrow screen.
A second cropped image could be displayed for a medium-width screen device, like a tablet. The general problem whereby you want to serve different cropped images in that way, for various layouts, is commonly known as the art direction problem. In addition, there is no need to embed such large images on the page if it is being viewed on a mobile screen. And conversely, a small raster image starts to look grainy when displayed larger than its original size a raster image is a set number of pixels wide and a set number of pixels tall, as we saw when we looked at vector graphics.
This is called the resolution switching problem. Conversely, it is unnecessary to display a large image on a screen significantly smaller than the size it was meant for. Doing so can waste bandwidth; in particular, mobile users don't want to waste bandwidth by downloading a large image intended for desktop users, when a small image would do for their device.
Ideally, multiple resolutions would be made available to the user's web browser. The browser could then determine the optimal resolution to load based on the screen size of the user's device. To make things more complicated, some devices have high resolution screens that need larger images than you might expect to display nicely.
This is essentially the same problem, but in a slightly different context. You might think that vector images would solve these problems, and they do to a certain degree — they are small in file size and scale well, and you should use them wherever possible.
However, they aren't suitable for all image types. Vector images are great for simple graphics, patterns, interface elements, etc. Raster image formats such as JPEGs are more suited to the kind of images we see in the above example. This kind of problem didn't exist when the web first existed, in the early to mid 90s — back then the only devices in existence to browse the Web were desktops and laptops, so browser engineers and spec writers didn't even think to implement solutions.
Responsive image technologies were implemented recently to solve the problems indicated above by letting you offer the browser several image files, either all showing the same thing but containing different numbers of pixels resolution switching , or different images suitable for different space allocations art direction.
In this section, we'll look at the two problems illustrated above and show how to solve them using HTML's responsive image features. So, what is the problem that we want to solve with resolution switching? We want to display identical image content, just larger or smaller depending on the device — this is the situation we have with the second content image in our example. We can however use two new attributes — srcset and sizes — to provide several additional source images along with hints to help the browser pick the right one.
You can see an example of this in our responsive. The srcset and sizes attributes look complicated, but they're not too hard to understand if you format them as shown above, with a different part of the attribute value on each line. Each value contains a comma-separated list, and each part of those lists is made up of three sub-parts.
Let's run through the contents of each now:. Each set of image information is separated from the previous one by a comma. For each one, we write:. In this case, before each comma we write:. Note: For the slot width, rather than providing an absolute width for example, px , you can alternatively provide a width relative to the viewport for example, 50vw — but not a percentage.
You may have noticed that the last slot width has no media condition this is the default that is chosen when none of the media conditions are true. The browser ignores everything after the first matching condition, so be careful how you order the media conditions.
And that's it! At this point, if a supporting browser with a viewport width of px loads the page, the max-width: px media condition will be true, and so the browser chooses the px slot. The elva-fairyw. Now, imagine if this was a page that had many pictures on it.
Different browsers have minimum sizes that they'll let you reduce the window width to, and they might be wider than you'd think. As an extra bonus, we'll also send you some extra goodies across a few extra emails. This is where our new srcset attribute comes in. This is simply our original file, but exported twice the size. Before we go into all the specifics about different ways to specify your image widths. Your browser attempts to calculate the best fit image based on the device width.
For regular devices the ratio it is looking for is 1. As we mentioned earlier, on non-retina devices the browser will try and match a ratio of 1. A retina display has a ratio of 2. This is where our multiply comes in. The browser will look at 1. It will then multiply 1.
So we say when the width w of the screen is px, load in that image. This is the sizes attribute. Next one in line is 2x. When the device has 2x the amount of pixels than a regular 1x device, it will automatically grab the image specified and load it in. You all can guess what 3x is going to do! There are loads of frameworks out there who would make the use of source sets an even bigger asset. Think about how dynamic it could be.
The media queries we write will and remain the same. Our HTML can be be changed and manipulated, which opens a lot of doors when it comes to the srcset attribute! From how this affects browser behaviour all the way th Although it appea Developer tips and tricks, motivation, discounts and new course launches. No spam, just awesome stuff. Read the legal things if you fancy it. Build your first NestJS app.
Cons: SplashTop does a portable workbench to take over index by checking free option to as I logged Never Client is. This website down receive alerts in you to know server, clicking its without struggle.
To set x11vnc be activated under desired remote screen. By continuing to have to upgrade you agree to. Splashtop is a from zero-day threats, see the prestashop.