Measuring Image Widths in JavaScript (Carefully!)

Let's say you want to find an <img /> on the page and find out how wide it is in JavaScript. Maybe you need to make some choices based on that width (or height, or both) You can definitely do that. The DOM will even give you a variety of dimensions to choose from depending on what you need. There is definitely a catch though.


Develop Locally, Use Images from Production

Working on your website locally means having the files that make your website tick right there on your computer. It's common those files live in a version control repository. You work on them, and push them up to the repo when you are ready. Other people work too, and you pull their changes back down.

What might not be in that repo, are images files from the CMS. WordPress is a classic example of this. When you upload an image in WordPress, it does a whole song and dance. It gets uploaded to the `uploads` folder, multiple versions are created, even the database is updated and attachment meta data happens. What doesn't happen is that a version control commit happens with all those files.


Using WebP Images

We've all been there before: You're browsing a website that has a ton of huge images of delicious food, or maybe that new gadget you've been eyeballing. These images tug at your senses, and for content authors, they're essential in moving people to do things.

Except that these images are downright huge. Like really huge. On a doddering mobile connection, you can even see these images unfurl before you like a descending window shade. You're suddenly reminded of the bad old days of dial-up.

This is a problem, because images represent a significant portion of what's downloaded on a typical website, and for good reason. Images are expressive tools, and they have the ability to speak more than copy can. The challenge is in walking the tightrope between visually rich content, and the speedy delivery of it.

The solution to this dilemma is not one dimensional. (more…)

Reducing JPG File size

There’s lots of neat tricks for reducing the size of JPGs in this article by Colt McAnlis:

With the Average webpage size now larger than the original DOOM game, you have to start asking where all the bytes are coming from, and how you can do more to toss those things out.

While JPG compression is impressive in its’ own right, how you use it in your application can influence the size of these files significantly. As such I’ve assembled a handy collection of things that can help you squeeze out those last bits, and make a better experience for your users.

Working with Images in Stylesheets with PostCSS

The following is a guest post by Aleks Hudochenkov. Aleks does a great job here of showcasing what PostCSS is good at and the role it has grown into in the front end stack. That is: doing little useful jobs within CSS. You're about to see a variety of PostCSS plugins at work that are all related to working with images. By the end, I bet you'll be able to imagine how PostCSS can be useful for other niches within working with CSS.