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The Origin Story of Container Queries


Container queries don’t exist today but a lot of web developers have been arguing in their favor lately. At first, the idea sounds relatively simple: whereas media queries allow us to make style changes based on the width of the browser, container queries would allow us to make style updates when...

The Thought Process Behind a Flexbox Layout


I just need to put two boxes side-by-side and I hear flexbox is good at stuff like that. Just adding display: flex; to the parent element lays out the children in a row. Well, that's cool. I guess I could have floated them, but this is easier. They should probably take up the full space they have...

Oh Hey, Padding Percentage is Based on the Parent Element’s Width


I learned something about percentage-based (%) padding today that I had totally wrong in my head! I always thought that percentage padding was based on the element itself. So if an element is 1,000 pixels wide with padding-top: 50%, that padding is 500 pixels. It's weird having top padding based...

What is super() in JavaScript?


What's happening when you see some JavaScript that calls super()?.In a child class, you use super() to call its parent’s constructor and super.<methodName> to access its parent’s methods. This article will assume at least a little familiarity with the concepts of constructors and child...

New York Stock Exchange Parent Firm Starts Futures Trading in Bitcoin


New York Stock Exchange owner Intercontinental Exchange Inc. (ICE) is launching futures trading in Bitcoin on its cryptocurrency arm Bakkt Trust Co, from today. Earlier in August, ICE had secured US government approval for futures trading in Bitcoin for Bakkt. Bakkt will give investors the option...

Various Methods for Expanding a Box While Preserving the Border Radius


I've recently noticed an interesting change on CodePen: on hovering the pens on the homepage, there's a rectangle with rounded corners expanding in the back. Expanding box effect on the CodePen homepage. Being the curious creature that I am, I had to check how this works! Turns out, the rectangle...

Don’t comma-separate :focus-within if you need deep browser support


I really like :focus-within. It's a super useful selector that allows you to essentially select a parent element when any of its children are in focus. Say you wanted to reveal some extra stuff when a <div> is hovered... div:hover { .extra-stuff { /* reveal it */ } } That's...

Position Sticky and Table Headers


You can't position: sticky; a <thead>. Nor a <tr>. But you can sticky a <th>, which means you can make sticky headers inside a regular ol' <table>. This is tricky stuff, because if you didn't know this weird quirk, it would be hard to blame you. It makes way more...

Restricting a (pseudo) element to its parent’s border-box


Have you ever wanted to ensure that nothing of a (pseudo) element gets displayed outside its parent's border-box? In case you're having trouble picturing what that looks like, let's say we wanted to get the following result with minimal markup and avoiding brittle CSS. The desired result. This...

Making width and flexible items play nice together


The short answer: flex-shrink and flex-basis are probably what you’re lookin’ for. The long answer Let’s say you want to align an image and some text next to each other with like this: Now let's say you reach for flexbox to make it happen. Setting the parent element to display: flex; is a good...

CSS Algorithms


I wouldn't say the term "CSS algorithm" has widespread usage yet, but I think Lara Schenck might be onto something. She defines it as: a well-defined declaration or set of declarations that produces a specific styling output So a CSS algorithm isn't really a component where there is some parent...

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