Kilian Valkhof

Building tools that make developers awesome.

My experience at Modern Frontends

Life, Web, 24 November 2022

Sometimes we want something to be true so badly, we ignore all the red flags. I had only spoken at this big of a conference once, and that was mostly by accident. So when my CFP got accepted to Modern Frontends, I was elated. A huge conference, in London, surrounded by amazing speakers.

Screenshotting VoiceOver on macOS

Accessibility, 31 October 2022

For an article I was writing I wanted to create a quick screenshot of one of the Rotor screens that Voiceover on macOS shows. I couldn't because when you have VoiceOver active the screenshot shortcuts (cmd + shift + 3/4) no longer work because they're captured by VoiceOver instead. If you also have this problem, you can use the screencapture command line tool.

When going somewhere does a thing: on links and buttons

Accessibility, CSS & HTML, 4 October 2022

At the Fronteers conference, Manuel during his presentation did an exercise on building HTML that seemed fairly straightforward. On the site of Max Böck there's a thing you can click to open up a theme selector. What's that thing?

On better browsers: arbitrary media queries and browser UIs

CSS & HTML, 14 September 2022

This morning Kitty Giraudel tweeted about an imaginary media query that would indicate right- or left-handedness and it made me imagine a future where sites can register support for one or more media features through a browser API, and the browser would offer these options in the UI.

Do you know about overflow: clip?

CSS & HTML, 11 August 2022

You probably know overflow: hidden, overflow: scroll and overflow: auto, but do you know overflow: clip? It's a relatively new value for the overflow property, and with Safari 16 being released later this year all evergreen browsers will support it. So what does it do?

Polypane browser for responsive web development and design Hi, I'm Kilian. I make Polypane, the browser for responsive web development and design. If you're reading this site, that's probably interesting to you. Try it out!

I develop more software and tools:


Use the design system you already have


A cross-platform, simple and smart autosaving scratchpad.

A Messenger Adventure!

Go on a text adventure in Facebook Messenger.


The latest Electron news, articles, apps and interviews.


Drag-and-drop lossless compression of PNG and JPG images for web.

Messenger Demo Viewer

Demo your (bot) interactions on Messenger.