Kilian Valkhof
Founder at Polypane browser for developers
Zoetermeer, The Netherlands
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Kilian is a front-end developer with over 20 years of experience that switched from building websites to building apps to build websites with. He is interested in modern web development, desktop app development and new technologies, and regularly speaks about topics like responsive websites, accessibility, design systems and Electron. Kilian is a frequent open source contributor.
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Understanding CSS Layout: the concepts underlying your (least) favorite language.
Have you ever felt perplexed by CSS, struggling to understand why the browser put the element where it did, and why it didn’t just follow the clear instructions you wrote? Do you think CSS is hard to work with?
By getting a better understanding of the concepts that underlie the language, you’ll learn to “see the matrix”. There’s normal flow, stacking context, offset parents… how do they interact with grid and flex layouts? This talk unveils those concepts in a fun and engaging way.
Stop using JavaScript for that: moving features from JS to CSS and HTML
Common patterns implemented with JavaScript are being replaced with "native" CSS and HTML equivalents that end up being more performant, more accessible and more resilient. Features like accordions, Autosuggest, smooth scrolling, dialogs, parallax scrolling and more no longer need JavaScript to work. We'll walk through common JS features that now have CSS and HTML equivalents that you can use, or will soon be able to use.
INTL: The best browser API you're not using
Browsers are shipping a massive API: INTL, which is chock-full of features most developer still do an NPM install for. The INTL API will save you time, effort and frustration.
Learn about all the wonderful built-in ways to deal with date formatting, lists, currencies, items and sentences in any language you can throw at the browser, without shipping literal megabytes of packages to your user.
TDC 2025 Sessionize Event
JSConf 2025 Sessionize Event
Frontmania 2025 Sessionize Event
Devworld Conference 2025 Sessionize Event
Frontmania 2024 Sessionize Event
Techorama 2024 Netherlands Sessionize Event
WeAreDevelopers World Congress 2024 Sessionize Event
Web Summer Camp 2024 Sessionize Event
TEQnation 2024 Sessionize Event
Webdevcon 2024 Sessionize Event
CodeMash 2024 Sessionize Event
WeAreDevelopers World Congress 2023 Sessionize Event
TEQnation 2023 Sessionize Event
Codemotion Madrid 2023 Sessionize Event
DeveloperWeek Europe 2023 Sessionize Event
A11Y.Lowlands Sessionize Event
Frontmania 2022 Sessionize Event
Init 2022 Dev Conference Sessionize Event
Tech A11y Summit Sessionize Event
Frontmania 2021 Sessionize Event
UX Y'all 2021 Sessionize Event
Kilian Valkhof
Founder at Polypane browser for developers
Zoetermeer, The Netherlands
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