on the web. At Google I/O in 2011, Wium Lie presented the video element in combination with the WebM format which Google had open-sourced. In 2008, he was spokesperson for a group of technical committee members who resigned over the decision by Standards Norway to vote for the approval of OOXML. Wium Lie has also promoted the concept of printing from the web. The third edition of his book on CSS, co-authored with Bert Bos, was produced from HTML and CSS files. These files were then converted to PDF by the Prince XML + CSS formatter. In 2005, he joined the board of YesLogic, the company that makes the Prince formatter. Building on his experience with web printing, in 2011 Wium Lie proposed to extend CSS to support pagination on screens. He has argued against the use of formatting objects and CSS Regions on the web. CTO of Opera Software In April 1999, Wium Lie joined Opera Software in Oslo, Norway as CTO. His move was motivated by seeing Opera programmers make more progress on implementing CSS in three months than what Netscape and Microsoft had achieved in three years. At Opera, he spearheaded the development of mobile browsers, in particular small-screen rendering of web pages. Small-screen rendering enabled Opera to show normal web pages on the small screens commonly found on feature phones running the Opera Mini browser. When Opera Software filed a complaint against Microsoft in the EU over Internet Explorer in 2007, Wium Lie was a spokesperson, stressing the need for Microsoft to fully support web standards in their browser. Opera's complaint led to a settlement where Microsoft started offering rival browsers from a browser choice screen to Windows users in Europe, and Wium Lie declared this a victory for the web. In 2013, Opera started a gradual transition from its own Presto web engine, to the WebKit engine also used by Safari and Google Chrome. Wium Lie said that it made most sense to work with the open-source communities than to continue developing its own engine. Political and civic activities In 2005, when politicians declared defeat against advertising towers on public pavements in Oslo, Wium Lie started the Stans.no campaign. In 2009, Stans!no filed a suit against the city for allowing advertising towers to be built in public places, and the city subsequently bought the advertising towers and dismantled them. After the advertising towers were removed,