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the trick: CSS position: sticky + mix-blend-mode: difference the bonus trick: add an extra layer and chain the blend to block content out 👨🍳
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![CSS Tip 🤙 You can create this header effect using position: sticky, clip-path, and custom properties 🔥 (Video 👀) header { position: sticky; top: var(--margin); } main { clip-path: inset(var(--header) 0 0 0);) } No mix-blend-mode or animations required ✨ What's the trick then? 🧐 Duplicate the header element first. Then fix the positioning of one behind the content. header[aria-hidden] { position: fixed; top: 0; margin-top: var(--margin); } Clip the top of the content to reveal the fixed header and put a sticky-positioned header inside it that matches up in position and size ✂️ :root { --header: calc(var(--margin) + var(--font-size)); } main { clip-path: inset(var(--header) 0 0 0); } header { position: sticky; top: var(--margin); } Make your life easier with custom properties 🙌 As the body scrolls, the fixed header gets covered by the clipped content and creates the effect ✨ And because the sticky header is "stuck" it reveals itself as the content goes out of view 😍 This one's pretty cool. You can set the font color to whatever you want. At first glance, it looked like it was a mix-blend-mode thing. It doesn't have to be! Think about it and lean into z-indexing 🫶 Watch the video to get an idea of things with the exploding view 🤯 Any questions, etc. let me know! Will likely do a YouTube video on this one too! 🙏 CodePen.IO link below! 👇](https://image.24vids.com/tw-1742391976517927321/ext_tw_video_thumb/1742387238879514624/pu/img/qhFKDDbPrYvBH8B6.jpg)
![CSS Tip! 💪 You can create these tab controls with CSS :has() + radio buttons ✨ .tabs:has(input:nth-of-type(3)) { --count: 3; } .tabs:has(:checked:nth-of-type(3)) { --active: 2; } .tabs::after { translate: calc(var(--active, 0) * 100%) 0; width: calc(100% / var(--count)); } Two CSS :has() tricks here combined with a rendering trick 🤙 The tab control is a container using display: grid. You can use :has() to count the number of tabs in the container: .tabs:has(input:nth-of-type(3)) { --count: 3; } .tabs:has(input:nth-of-type(4)) { --count: 4; } Using the cascade, the last valid :has() gives you the number of tabs 🫶 Once you know the number of tabs, you know how to size the indicator: .tabs::after { content: ""; position: absolute; height: 100%; width: calc(100% / var(--count)); } It's a pseudoelement that uses --count to determine its size 📏 The next :has() trick is determining which tab is active or :checked as it's an input [type=radio] .tabs:has(:checked:nth-of-type(2)) { --active: 1; } .tabs:has(:checked:nth-of-type(3)) { --active: 2; } You can use a zero-indexed translation here. If the second input is :checked, set --active: 1, then translate the pseudoelement on the tabs to that position 👉 .tabs::after { translate: calc(var(--active, 0) * 100%) 0; } The last rendering trick is using mix-blend-mode 👀 The tabs have a black background-color, the pseudoelement is white, and the label text is white. When you use mix-blend-mode: difference on the pseudoelement it will give this effect that the text transitions from white to black sliding across 😎 .tabs::after { color: hsl(0 0% 100%); mix-blend-mode: difference; } You can totally mix up the colors here though and go with a different effect. The mechanics of how you can use CSS :has() is the main point here 🙏 As always, any questions, suggestions, etc. let me know CodePen.IO link below! 👇 (There's even a Tailwind CSS play for this one too 👀)](https://image.24vids.com/tw-1746099478656901617/ext_tw_video_thumb/1746099293872898048/pu/img/oonp9Ek6MULFcFjk.jpg)
![CSS Trick 🤙 You can create these tab bar controls by using :has() to count the number of tabs ⭐️ .tabs:has(input:nth-of-type(3)){--count: 3;} .tabs:has(:checked:nth-of-type(3)){--active: 200%;} .tabs::after{ translate:var(--active) 0;} Let's break it down in this ! 📼 Couple of CSS :has() tricks here combined with custom properties 😎 First things first, lay out the tabs using display: grid. This gives you a way to create equal-width tabs 🙏 .tabs { display: grid; grid-auto-flow: column; } Then you use :has() to count the number of tabs and store that in a custom property 🤓 .tabs:has(input:nth-of-type(3)) { --count: 3; } .tabs:has(input:nth-of-type(4)) { --count: 4; } Using the cascade, the last valid :has() gives you the number of tabs 🫶 Using the tab count, you can size the tab indicator. For the tab indicator, use the tabs pseudoelement: .tabs::after { content: ""; position: absolute; height: 100%; width: calc(100% / var(--count)); } See how you can use --count to determine its size 📏 Next, use :has() to determine which tab is active or :checked with input [type=radio] .tabs:has(:checked:nth-of-type(2)) { --active: 1; } .tabs:has(:checked:nth-of-type(3)) { --active: 2; } You can use a zero-indexed translation here. If the second input is :checked, set --active: 1, then translate the pseudoelement on the tabs to that position 👉 .tabs::after { translate: calc(var(--active, 0) * 100%) 0; } Or you could set active to the translation: .tabs:has(:checked:nth-of-type(2)) { --active: 100%; } Setting the custom property allows you to use the index elsewhere if you need it 🤙 The final piece is using mix-blend-mode 👀 The tabs have a black background-color, the pseudoelement is white, and the label text is white. When you use mix-blend-mode: difference on the pseudoelement it will give this effect that the text transitions from white to black sliding across 😎 .tabs::after { color: hsl(0 0% 100%); mix-blend-mode: difference; } You can totally mix up the colors here though and go with a different effect. The mechanics of how you can use CSS :has() is the main point here 🙏 As always, any questions, suggestions, etc. let me know CodePen.IO link below! 👇 (There's even a Tailwind CSS play for this one too 👀)](https://image.24vids.com/tw-1750370338041647245/ext_tw_video_thumb/1750367384505081856/pu/img/ZVW6XE5SU4mBEB5M.jpg)
