Bram.us
Bramus Van Damme — Chrome Developer Relations at Google
A rather geeky/technical weblog, est. 2001, by Bramus
bram.usWhen you size something to be 100vw wide, it is sized to fill up the entire viewport width… which can cause overflow when there is a vertical scrollbar present.
A web development blog running since 2001, written by Bramus Van Damme — now part of Google's Chrome Developer Relations team. Bram.us is the go-to source for what's actually new and useful in CSS, from scroll-triggered animations to anchor positioning to the quirks of viewport units. Posts are practical and example-driven, the kind of blog where you learn something you can use immediately.
Written by Bramus Van Damme since 2001.
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English
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Experiment: Animating CSS position-area with View Transitions
https://www.bram.us/wordpress/wp-content/uploads/2026/03/animate-position-area.mp4Recording of the demo. ~ CSS Anchor Positioning is a powerful tool, but one of the things that you cannot do natively (yet) is animating the position-area property. This blog post introduces a technique to animate position-area changes using View Transitions. ~ 🌟 This post is about CSS Anchor Positioning. If you are not familiar with the basics of it, check out this 30-min talk of mine to get up to speed. ~ Th...
Anchors Aweigh! (2026.02.28 @ State of the Browser)
Me, on stage. Photo by Josh I’m currently in London, attending the wonderful State of the Browser conference. Earlier today I opened the conference with a talk about CSS Anchor Positioning. ~ Table of Contents The Talk Slides Recording/Video Thanks! ~ # The Talk This talk was a brand new talk (which I had rehearsed at PHPAntwerp just 2 days before) about CSS Anchor Positioning. It’s a high-energy, fast-paced talk that packs a lot of information in ±30 minutes. We’ve all been there. Yo...
Chrome 145 146 adds Experimental Support for Vertical Tabs
Chrome 145 with the tabs shown to the side (vertical tabs) and a collapsed tab bar Vertical Tabs are available behind a flag in Chrome 145 (current Chrome Beta) UPDATE: The flag for this experimental feature moved up to Chrome 146 (current Chrome Canary). ~ The feature is available in preview behind a feature flag. First you need to flip the flag (to enable the feature) and then choose the vertical tabs layout (to apply the feature): Navigate to chrome://flags/#vertical-tabs Set the dropdown...
Using 100vw is now scrollbar-aware (in Chrome 145+, under the right conditions)
From Chrome 145 onwards, 100vw will automatically subtract the size of the (vertical) scrollbar from it if you have forced the html element to always show a vertical scrollbar (using overflow[-y]: scroll) or if you reserve space for it (using scrollbar-gutter: stable). The same applies to vh with a horizontal scrollbar, as well as all small, large, and dynamic variants. ~ The problem with CSS Viewport Units The problem with CSS Viewport Units (vw and friends) is that those units do not take the...
How to Find the public WebKit Bug from the Apple-internal rdar:// Bug ID
If you read the Safari release notes – like the Safari 26.2 release notes – you see a lot of trailing “(12345678)”-mentions in the list of fixed bugs. These numbers are Apple-internal bug IDs, as used within Apple’s internal bug tracker (fka?) named “Radar”. These numbers are not linked to anything because Radar is Apple-internal, so to external people these numbers are practically useless … or are they? ~ The need for more info The thing is, that I sometimes like to look up some details behind...
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