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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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taskInputHash: 3d8283d38a166afd
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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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date_published: '2025-02-07'
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date_modified: '2025-02-07'
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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_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 the purpose of `srcset` and `sizes`, we need to know at what point 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 scaled down, hidden, or repositioned on smaller screens – or more often, what should be expanded, revealed, or added on larger screens. They have very little information to base this on. Is the user on a tablet or a phone in landscape mode – 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 where the layout changes. This is called a **breakpoint**. It is an arbitrary number of CSS pixels ([not device pixels](/de/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) about 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 (such as logos, icons, or buttons) might be immune to the layout shifts caused by these breakpoints (and do well with [srcset density descriptors](/de/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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Main content images are constrained by the size of their container. Typically, the main content area of a page is restricted to a specific width, a `max-width`, on the largest screens, but on smaller screens, the main content area will fill 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 certain breakpoints, it becomes harder to calculate the effective sizes rules because the percentage of the viewport width that the image occupies will change.
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### The easy way
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### The Simple 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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That said, don't overthink this. You will likely be very satisfied with the following approximation:
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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? Up to this viewport width, we can use `100vw` for the `sizes` attribute of the image to say that the image takes up 100% of the viewport width.
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2. What is the maximum width that this container ever reaches? We can set this 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 was 700px and your answer to 2 was 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. -->
> One might think that the browser could wonderfully carry out all these calculations for us based on the CSS. Unfortunately, browsers are impressively eager to choose an image URL *before* downloading the stylesheets. Therefore, we must perform the calculations ourselves, and it's just as well if we don't get it perfect.
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> 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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{{Clumsy phrasing: "and it's just as well if we don't get it perfect." could be clearer if phrased more directly, such as "and if we don't get it perfect, it's understandable."}}
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=====================
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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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taskInputHash: 3cf5b3ab39ae8310
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title: How the Browser Chooses
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description: How the browser chooses between images listed in the srcset attribute
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date_published: '2025-02-07'
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date_modified: '2025-02-07'
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lang: en
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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 choose between the images listed in the `srcset` attribute? Here is a step-by-step guide with examples for both width and density specifications and how the browser decides based on the 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 choose the most appropriate image from a list of provided sources. These rules depend on both the display characteristics of the device (resolution, pixel density) and 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) display 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-small.jpg: 400 \* 1 = 400px
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- example-medium.jpg: 800 * 1 = 800px
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- example-medium.jpg: 800 \* 1 = 800px
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- example-large.jpg: 1600 * 1 = 1600px
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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 with the viewport width. Suppose 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 chooses `example-medium.jpg`.
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2. Density descriptor ("x"):
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1\. Pixel 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) display 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 DPR of the device 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. Choose the image with the `x` descriptor that most closely matches the DPR of the device. 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 is important to note that you can use the `sizes` attribute in combination with the `srcset` attribute to provide more information about how the image will be displayed at different viewport widths. This is especially useful when using the width descriptor (`w`). Here is an example:
{{The original German text doesn't specifically mention any ambiguity or clumsy phrasing that would require corrective inputs in English. The document seems to follow logical and clear instructions in the technical language. However, there is an unfinished example in the last block of code snippets; it ends abruptly suggesting more content was intended but not provided.}}
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=====================
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1. How the browser chooses
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2. How the browser chooses between images listed in the srcset attribute
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Metadata returned1. Wie der Browser auswählt
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2. Wie der Browser zwischen Bildern im "srcset"-Attribut auswählt
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Metadata returned1. Wie der Browser wählt
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2. Wie der Browser zwischen den im srcset-Attribut aufgelisteten Bildern wählt
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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taskInputHash: 8188e69e4133ac64
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title: Density Descriptions and Srcset
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description: Examples of using density descriptions in `srcset`
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date_published: '2025-02-07'
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date_modified: '2025-02-07'
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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_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 descriptions offers a simple and effective method to deliver the most suitable image to each user device, thereby enhancing performance and user experience. This guide will walk you through the basics of using srcset with density descriptions and provide you with markup examples.
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## What is srcset with density descriptors?
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## What is Srcset with Density Descriptions?
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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 descriptions (`x`) are used along with Srcset to provide images of different resolutions based on 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 Descriptions?
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Using srcset with density descriptors is especially useful when you:
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1. Want to provide highresolution 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 descriptions is particularly useful when you:
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1. Want to deliver high-resolution images to displays with high DPI (e.g., Retina displays) while providing standard resolution images to standard displays.
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2. Want to improve page performance by providing the image size that is most suitable for the user's device.
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## Implementing srcset with density descriptors
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## Implementing Srcset with Density Descriptions
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To use srcset with density descriptors, follow these steps:
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To use Srcset with density descriptions, 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, including the image sources and the corresponding density descriptions.
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3. Add the `sizes` attribute (optional) to set the size of the image as it appears on 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 descriptions 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 that is displayed if the browser does not support srcset.
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- **srcset**: The list of image sources and their density descriptions (1x, 2x, 3x). The browser selects the most suitable image based on 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 descriptions, improving your website's performance and user experience.
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{{No mistakes or awkward phrasing were detected in this translation.}}
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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. Dichtebeschreibungen und Srcset
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2. Beispiele für die Verwendung von Dichtebeschreibungen in `srcset`
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