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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...

Dealing with overflow and position: sticky;


Any overflow value other than visible and no height is the enemy of child elements with position: sticky;. It's like that element is ready to stick when the parent scrolls, but it never does because the height is unconstrained. Adding a fixed height can solve the issue, but that's not always...

Stuff you can do with CSS pointer events


Martijn Cuppens (the same fella with the very weird div!) has some more irresistible CSS trickery. Three of the examples are about making a child element trigger an event on a parent element (almost like the magic that is :focus-within). Here's how I reasoned it out to myself: You know how if...

Responsive Knockout Text With Looping Video


Here’s an idea! Let’s make an an HTML <video> play inside the shape of some letters. Like "Knockout Text" except instead of an image behind, it’s video. A live demo will explain more clearly: See the Pen basic pen by Giulio Mainardi (@mgiulio) on CodePen. A key objective here is to develop...

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