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Hi, you've reached the User page of Tantek Çelik. Due to W3C account limitations/defaults, the "Ç" in my last name was dropped from the "official" login username and has propagated as such on

Please use "Tantek Çelik" not "Tantekelik" in references. Thanks.

Tantek Çelik
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next actions

  • add public domain template user page template to W3C wiki (based on the same at microformats wiki)
  • add said template to my user page




CSSWG projects, alphabetically listed (not priority)


HTMLWG projects (some of these have been completed. needs updating)

time element issues

1. Enhance and simplify the time element. A change proposal to enhance and simplify the time element based on use-cases and needs documented to date: User:Tantekelik/time_element

2. Add a data element. A change proposal to introduce a simple data element for use with microformats, microdata, RDFa based on use-cases of the general class of human vs. machine data publishing: User:Tantekelik/data_element

3. Drop the pubdate attribute. A change proposal to drop the pubdate attribute as part of completing the removal of the Atom conversion algorithm which itself hasn't been a part of the W3C HTML5 specification for over a year: User:Tantekelik/drop_pubdate

4. Enhance the time element to fully represent the date time types that the input element can capture. Most of these are also covered by issue 1, with the exception of year-week only dates and thus this is a delta issue from that issue with a corresponding delta change proposal: User:Tantekelik/time_input_match

change proposals

HTMLWG reference


How do I participate in a working group

Q: How do I participate in a W3C Working Group?

A1: If you are an employee of a member company, ask your AC representative to add you to the working group.

A2: If you are an individual not employed by a member company:

Most working groups work publicly with a public mailing list that anybody can join.

In practice nearly all working groups are resource constrained for their work. Thus working groups are incentivized to recognize capable public individual participants and offer them invited expert status in the group to help with working group tasks.

In particular, take the following steps:

  1. Join the IRC channel and public mailing list of the working group (WG)
  2. Participate in good faith in IRC and the mailing list, and help out e.g. by:
    • documenting specific real world use-cases they think the WG should solve
    • pointing out errors/issues/improvements in specs
    • contributing test cases for WG technologies
    • provide helpful answers and responses to various questions raised

In practice, individuals that have shown up and consistently positively participated in this manner have been invited to become invited experts in many working groups, e.g. CSS. Often this invitation occurs by a WG chair or other member getting to know the individual, advocating for them inside the working group, and then reaching a consensus decision to invite the individual.


completed 2018

completed 2017

  • W3C HTML Working Group - representative, Mozilla. With the formal announcement of WHATWG work modes and such, completely switched to participating with WHATWG for HTML.
  • TPAC2017 breakout day facilitator

completed sometime between these

  • Fullscreen - licensing work done, redirect to living standard at WHATWG.

W3C AB projects:

  • Advancing open licensing, e.g. the htmlwg HTML5 Extensions experiment

completed 2011


other W3C wikis

By default each W3C group gets their own wiki. I find that having to log into each of these separately is a bit annoying. My preference is to put all W3C related wiki pages into the top level W3C wiki:

However, for reference, here are other W3C wikis that I am editing/contributing to while their respective groups still use them.