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Copy file name to clipboardexpand all lines: src/content/docs/de/_roundtrip_breakpoints.txt
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---
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title: Breakpoints & Images
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description: Why some (but not all) breakpoints are important for your images
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taskInputHash: 57ab72e7e951b197
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taskInputHash: c4a3c6347eb6480a
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lang: en
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ignore: '/* cSpell:locale de,en*/'
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date_published: '2023-03-26'
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date_published: '2023-03-31'
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date_modified: '2023-03-31'
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date_updated: '2023-03-31'
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---
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### Background
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Small screens and big monitors require different layouts. For `srcset` and `sizes`, we need to know when the layout changes.
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Small screens and large monitors require different layouts. For `srcset` and `sizes`, we need to know when the layout changes.
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Web developers need to decide what should be scaled down, hidden, or moved on smaller screens - or decide what should be expanded, revealed, or added on larger screens. They also have very little information available. Is the user on a tablet or phone in landscape mode or in a small browser window?
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Web developers need to decide what should be shrunk, hidden, or shifted on smaller screens—or, more commonly, what should be expanded, revealed, or added on larger screens. They also have very few clues. Is the user on a tablet or phone in landscape, or in a small browser window?
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We have to choose an arbitrary viewport width at which the layout changes. This is called a **breakpoint**. It can be any number of CSS pixels ([not device pixels](/en/pixels-not-pixels)). Polypane has a [great article](https://polypane.app/blog/the-breakpoints-we-tested-in-2021-and-the-ones-to-test-in-2022/#the-breakpoints-to-develop-on-in-2023) on commonly used breakpoints.
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We need to choose an arbitrary viewport width at which the layout changes. This is called a **breakpoint**. It's an arbitrary number of CSS pixels ([not device pixels](/en/pixels-not-pixels)). Polypane has a [great article](https://polypane.app/blog/the-breakpoints-we-tested-in-2021-and-the-ones-to-test-in-2022/#the-breakpoints-to-develop-on-in-2023) on commonly used breakpoints.
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Some images (like logos, icons, or buttons) can be immune to the layout shifts caused by these breakpoints (and are okay with [srcset density descriptors](/en/density-descriptors)).
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Some images (like logos, icons, or buttons) might be immune to layout shifts caused by these breakpoints and are fine with [srcset density descriptors](/en/density-descriptors).
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Main content images are limited by the size of their container. Typically, the main area of a page layout is constrained to a specific width, a `max-width`, on the largest screens, but on small screens the main content area fills the entire viewport.
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Images in the main content are constrained by the size of their container. Usually, the main content area of a page is limited to a certain width on the largest screens, a `max-width`, but on small screens, the main content area fills the entire viewport.
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When you have more than one column at some breakpoints, it becomes difficult to compute the effective size rules because the percentage of viewport width taken up by the image changes.
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If you have more than one column at some breakpoints, it becomes harder to calculate the effective sizing rules since the percentage of viewport width that the image occupies changes.
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### The easy way
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### The easy method
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That doesn't mean you should smash your head against the wall. You will likely get very far with the following approach:
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Still, you shouldn't overthink this. With the following approach, you'll likely do just fine:
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1. At what size does the main column (or the container of the image) stop growing? Until that viewport width, we can use `100vw` for the `sizes` attribute of the image to indicate that the image takes up 100% of the viewport width.
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2. What is the maximum width the container will ever be? We can set that as a fixed `width` for everything else.
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1. At what size does the main column (or the image's container) stop growing? Below that viewport width, we can use `100vw` for the image's `sizes` attribute to say that the image takes up 100% of the viewport width.
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2. What's the maximum width that this container ever reaches? We can set that as a fixed `width` for everything else.
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If your answer to 1 is 700px and your answer to 2 is 800px, you can use the following `sizes` attribute:
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If your answer to 1 is 700px, and your answer to 2 is 800px, you can use the following `sizes` attribute:
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```html
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<!-- These are CSS pixels, not device pixels or image pixels. -->
> You would think that the browser could kindly do all these calculations for us based on the CSS. Unfortunately, browsers are aggressively trying to choose an image URL *before* downloading stylesheets. So we have to do the calculations ourselves. And if we're not perfect, that's their problem.
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> You might think that the browser could do all these calculations for us nicely based on CSS. Unfortunately, browsers are very eager to pick an image URL *before* downloading the stylesheets. So we have to do the calculations ourselves, and it's their prerogative to handle it gracefully if we don't get it perfect.
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=====================
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Content prompt used:
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2. Why some (but not all) breakpoints matter for your images
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Metadata returned1. Breakpoints & Bilder
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2. Warum manche (aber nicht alle) Breakpoints wichtig für Ihre Bilder sind
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2. Warum einige (aber nicht alle) Breakpoints für Ihre Bilder wichtig sind
Copy file name to clipboardexpand all lines: src/content/docs/de/_roundtrip_browser-picks-srcset.txt
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---
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title: How the Browser selects
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description: How the browser selects between images listed in the "srcset" attribute
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taskInputHash: 21fa78dd27583003
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title: How the browser chooses
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description: How the browser selects between images in the srcset attribute
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taskInputHash: de4c5e9ccd50e3e2
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lang: en
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date_published: '2023-03-31'
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date_modified: '2023-03-31'
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date_updated: '2023-03-31'
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---
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How does the browser select between images listed in the "srcset" attribute? Here is a step-by-step guide with examples for both width and density descriptors and how the browser decides based on the device and viewport.
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How does the browser decide between images listed in the `srcset` attribute? Here are the steps with examples for both width and density specifications and how the browser decides based on device and viewport.
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- When using the "srcset" attribute in HTML, the browser uses a set of rules to select the most suitable image from a list of provided sources. These rules depend on both the display characteristics of the device (resolution, pixel density) and the size of the viewport. The "srcset" attribute allows you to specify different images based on width (using the "w" descriptor) or pixel density (using the "x" descriptor). Let's go through examples for both cases.
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- When using the `srcset` attribute in HTML, the browser uses a set of rules to select the best image from a list of provided sources. These rules depend both on the display properties of the device (resolution, pixel density) and on the viewport size. The `srcset` attribute allows you to specify different images based on width (using the `w` descriptor) or pixel density (using the `x` descriptor). Let's go through each case with examples.
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1. Width descriptor ("w"):
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1. Width descriptor (`w`):
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Assuming we have the following "srcset" attribute:
a. Determine the DPR (Device Pixel Ratio) of the device. For instance, a standard display has a DPR of 1, while a high-resolution (Retina) display has a DPR of 2 or higher.
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a. Determine the DPR (device pixel ratio) of the device. For example, a standard display has a DPR of 1, while a high-resolution (Retina) screen has a DPR of 2 or higher.
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b. Calculate the effective width for each image in the "srcset". Multiply the width descriptor by the DPR. For a device with a DPR of 1:
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b. Calculate the effective width for each image in the `srcset`. Multiply the width descriptor by the DPR. For a device with a DPR of 1:
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- example-small.jpg: 400 * 1 = 400px
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- example-medium.jpg: 800 * 1 = 800px
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- example-large.jpg: 1600 * 1 = 1600px
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c. Compare the effective widths to the viewport width. Assuming the viewport width is 420px, the browser selects the smallest image whose effective width is greater than or equal to the viewport width. In this case, "example-medium.jpg" is selected.
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c. Compare the effective widths to the viewport width. Assuming the viewport width is 420px, the browser selects the smallest image with an effective width that is greater than or equal to the viewport width. In this case, it selects `example-medium.jpg`.
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2. Density descriptor ("x"):
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2. Density descriptor (`x`):
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Assuming we have the following "srcset" attribute:
a. Determine the DPR (Device Pixel Ratio) of the device. For instance, a standard display has a DPR of 1, while a high-resolution (Retina) display has a DPR of 2 or higher.
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a. Determine the DPR (device pixel ratio) of the device. For example, a standard display has a DPR of 1, while a high-resolution (Retina) screen has a DPR of 2 or higher.
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b. Compare the device's DPR with the "x" descriptors in the "srcset". In this case, we have three images with the following descriptors:
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b. Compare the device's DPR with the `x` descriptors in the `srcset`. In this case, we have three images with the following descriptors:
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- example-1x.jpg: 1x
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- example-2x.jpg: 2x
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- example-3x.jpg: 3x
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c. Select the image with the "x" descriptor closest to the device's DPR. For a device with a DPR of 1, the browser selects "example-1x.jpg". For a device with a DPR of 2, it selects "example-2x.jpg", and so on.
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c. Select the image with the `x` descriptor that is closest to the device's DPR. For a device with a DPR of 1, the browser selects `example-1x.jpg`. For a device with a DPR of 2, it selects `example-2x.jpg`, and so on.
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It is important to note that you can also use the "sizes" attribute in combination with the "srcset" attribute to provide further information on how the image should display at different viewport widths. This is particularly useful when using the width descriptor ("w"). Here is an example:
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It's important to note that you can use the `sizes` attribute in conjunction with the `srcset` attribute to provide more information on how the image will be displayed at different viewport widths. This is particularly useful when using the width descriptor (`w`). Here's an example:
Copy file name to clipboardexpand all lines: src/content/docs/de/_roundtrip_density-descriptors.txt
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---
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title: Density descriptors and srcset
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description: Examples of using density descriptors in `srcset`
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taskInputHash: 0a85d4f28fee785a
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title: Density Descriptors & Srcset
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description: Examples of using Density Descriptors in `srcset`
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taskInputHash: e8e75c8aa7c54e67
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lang: en
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ignore: '/* cSpell:locale de,en*/'
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date_published: '2023-03-26'
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date_published: '2023-03-31'
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date_modified: '2023-03-31'
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date_updated: '2023-03-31'
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---
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Srcset with density descriptors provides a simple and effective method for delivering the most appropriate image for each user's device, improving performance and user experience. This guide will take you through the basics of using srcset with density descriptors and provide markup examples for your convenience.
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Srcset with density descriptors provides a simple and effective way to deliver the most suitable image for each user’s device, enhancing performance and user experience. In this guide, you will learn the basics of using srcset with density descriptors and get markup examples to illustrate.
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## What is srcset with density descriptors?
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## What is Srcset with Density Descriptors?
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Srcset is an HTML attribute that allows you to specify multiple image sources for a single `<img>` element. Density descriptors (`x`) are used in conjunction with srcset to provide images at different resolutions based on the pixel density of the user's display.
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Srcset is an HTML attribute that allows you to specify multiple image sources for a single `<img>` element. Density descriptors (`x`) are used with srcset to provide images with different resolutions according to the pixel density of the user's screen.
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## When to use srcset with density descriptors?
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## When to use Srcset with Density Descriptors?
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Using srcset with density descriptors is especially useful when you:
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1. Want to provide high resolution images for high DPI displays (e.g. Retina displays) while using lower resolutions for standard displays.
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2. Want to improve page rendering by providing the most appropriate image size for each user's device.
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Using Srcset with Density Descriptors is particularly useful when you want to achieve the following:
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## Implementing srcset with density descriptors
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1. Provide high-resolution images on high-resolution displays (e.g., retina displays) while providing low-resolution images on standard displays.
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2. Improve page performance by providing the most suitable image size for each user's device.
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## Implementing Srcset with Density Descriptors
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To use Srcset with Density Descriptors, follow these steps:
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To use srcset with density descriptors, follow these steps:
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1. Prepare your images in different resolutions.
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2. Add the `srcset` attribute to the `<img>` element, including the image sources and corresponding density descriptors.
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3. Optionally, add the `sizes` attribute to set the size of the image on the screen.
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2. Add the `srcset` attribute to the `<img>` element, and specify the image sources along with the corresponding Density Descriptors.
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3. Add the `sizes` attribute (optional) to specify the size of the image on the screen.
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### Markup example
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### Markup Example
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Here is an example of how to implement srcset with density descriptors in your markup:
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Here is an example of how you can implement Srcset with Density Descriptors in your markup:
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```html
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<img src="example-image-1x.jpg"
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```
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This markup example includes:
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- **src**: The default image source to be displayed when the browser does not support srcset.
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- **srcset**: The list of image sources and their density descriptors (1x, 2x, 3x). The browser chooses the most appropriate image based on the user's display.
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- **src**: The default image source displayed if the browser doesn't support Srcset.
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- **srcset**: The list of image sources and their Density Descriptors (1x, 2x, 3x). The browser selects the most suitable image according to the user's display.
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- **alt**: A description of the image for accessibility purposes.
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And that's it! You have successfully implemented srcset with density descriptors, improving the performance and user experience of your website.
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And that's it! You have successfully implemented Srcset with Density Descriptors, enhancing the performance and user experience of your website.
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=====================
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Content prompt used:
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1. Density descriptors & srcset
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2. Examples of using density descriptors in `srcset`
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Metadata returned1. Density-Descriptoren und Srcset
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2. Beispiele für die Verwendung von Density-Descriptoren in `srcset`
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Metadata returned1. Density-Descriptoren & Srcset
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2. Beispiele zur Verwendung von Density-Descriptoren in `srcset`
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