Rune Lillesveen
Staff Software Engineer at Google
Viken, Norway
Summary
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Top SchoolRune Lillesveen is a Staff Software Engineer with over 25 years of experience and a decade focused on Chromium/Blink, where he leads CSS implementation as a tech lead and hands-on contributor for Chrome's core rendering. He has deep expertise in CSS layout engines from long tenure at Opera through to Google, and contributes to W3C CSS Working Group drafts—adding and clarifying specs such as @starting-style and container-query related features. Based in Viken, Norway, Rune combines systems-level browser engineering with standards work, bridging product-quality implementations and spec design. An MSc in Computer Science from NTNU, he’s known for owning core Blink components and for the uncommon mix of long-term maintenance, specification authorship, and shipping browser-grade rendering features.
10 years of coding experience
20 years of employment as a software developer
Norwegian University of Science and Technology
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (3)
css10
css-transitions9
documentation9
Programming languages (8)
Github contributions (5)
w3c/csswg-drafts
Jun 2019 - Oct 2022
CSS Working Group Editor Drafts
Role in this project:
Technical Writer & CSS Specification Contributor
Technical Writer & CSS Specification ContributorContributions:47 reviews, 6 commits, 47 PRs in 3 years 5 months
Contributions summary:Rune primarily contributed to the documentation and specification of CSS features within the W3C CSS Working Group drafts repository. Their work included adding and refining the specification for the `@starting-style` rule, as well as making various adjustments and clarifications to existing specifications like `css-overflow-3`, `css-align-3`, and `css-contain-3`. The contributions involved code edits, grammar improvements, and addressing issues related to container queries and scroll state features.
css
lilles/wpt
Nov 2020 - Jun 2026
Test suites for Web platform specs — including WHATWG, W3C, and others
Contributions:3 pushes, 3 branches in 5 years 7 months
web-platformtestingsuitesspecsspec
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