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Fluid Images in a Variable Proportion Layout

Creating fluid images when they stand alone in a layout is easy enough nowadays. However, with more sophisticated interfaces we often have to place images inside responsive elements, like this card:

For now, let’s say this image is not semantic content, but only decoration. That’s a good use for background-image. And because in this context the image contains an object, we can’t allow any parts to be cropped out when it’s responsive, so we’d pick background-size: contain.

Here’s where … Read article “Fluid Images in a Variable Proportion Layout”

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A Guide to the Responsive Images Syntax in HTML

This guide is about the HTML syntax for responsive images (and a little bit of CSS for good measure). We'll go over srcset and , plus a whole bunch of things to consider to help you get the best performance and design control from your images.
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Workflow Considerations for Using an Image Management Service

There are all these sites out there that want to help you with your images. They do things like optimize your images and help you serve them performantly.

That's a very good thing. By any metric, images are a major slice of the resources on websites, and we're notoriously bad at optimizing them and doing all the things we could to lower the performance hit from them. So you use some service to help you deliver images better. Smart. Many of them will make managing and optimizing images a lot easier. But I don't consider them a no-brainer. There is a lot to think about, like making choices that don't paint you into a corner.

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Getting Netlify Large Media Going

I just did this the other day so I figured I’d blog it up. There is a thing called Git Large File Storage (Git LFS). Here’s the entire point of it: it keeps large files out of your repo directly. Say you have 500MB of images on your site and they kinda need to be in the repo so you can work with it locally. But that sucks because someone cloning the repo needs to download a ton of … Read article “Getting Netlify Large Media Going”

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Tips for rolling your own lazy loading

You may have heard (or even issued the call) that “we can just use lazy loading!” when looking for a way to slim down a particularly heavy web page.

Lazy loading is a popular technique for gradually requesting images as they come into view, rather than all at once after the HTML of the page has been parsed. It can reduce the initial page weight, and help us hit our performance budgets by requesting images when they’re needed.

It can … Read article “Tips for rolling your own lazy loading”

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Planning for Responsive Images

The first time I made an image responsive, it was as simple as coding these four lines:

img {
  max-width: 100%;
  height auto; /* default */
}

Though that worked for me as a developer, it wasn’t the best for the audience. What happens if the the image in the src attribute is heavy? On high-end developer devices (like mine with 16GB RAM), few or no performance problems occur. But on low-end devices? It’s another story.… Read article “Planning for Responsive Images”

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FUIF: Responsive Images by Design

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Sometimes `sizes` is quite important.

Paraphrased question from email:

I just read your article Responsive Images: If you’re just changing resolutions, use srcset. In the age of “responsive websites,” srcset does not help in certain situations. For example, I have a popular products slider. On mobile, I have one image per slide where the images are 320px wide. On desktop, I have six images per slide where each is 160px wide. So the desktop images are smaller on desktop, not bigger.

How do I

Read article “Sometimes `sizes` is quite important.”
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An Almost Ideal React Image Component

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The Four Big Ways Jetpack Helps with Image Performance

We’ve been working with Jetpack around here as a sponsor. It’s a great match because as someone with a bunch of self-hosted WordPress sites, Jetpack is one of those no-brainer plugins for me. Jetpack can do a ton of good things for any site in a variety of very different ways. Here’s one way to think about it: it brings the power of WordPress’ own massive servers to you.

For now, let’s just focus on one angle of what … Read article “The Four Big Ways Jetpack Helps with Image Performance”