I've personally found collapsing very useful on mobile in big long articles for skipping through sections/content without having to scroll down a lot. Also seeing them collapsed on mobile first makes a good TOC-like experience providing a nice overview.

This can be a good experiment to run to learn the real relevance of collapsing for readers. About the desktop proposal, the wider form factor and the TOC probably make unnecessary having collapsing, but it is something worth reviewing since it may be useful IMO.

On Fri, Dec 19, 2014 at 12:26 AM, Jon Robson <jdlrobson@gmail.com> wrote:

Okay I had a long hard think about this.
I would suggest the following EventLogging experiment on the mobile website:

Question to answer: If section collapsing is provided to users in such
a way that sections are open by default, do users find the ability to
collapse sections a useful feature?

To run this experiment:
* We will run EventLogging on a certain set of pages that we know are
popular on tablet devices (we can make this configurable - maybe set
to the top 5 visited articles on the previous day)
* We will log an event for page views to these pages with a unique session id
* We will log an event when a section is toggled closed on these
pages with the same unique session id
* After collecting substantial data on the target pages we will
analyse that data to see what we find. What % of visits toggled close
at least one section. We can then come back to this discussion with a
proposal over whether we think it would be a useful feature on
desktop.

Eallan is this something you would be interested in doing with
guidance and support for the mobile web team?

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