Reading/Web/Desktop Improvements/Features/Limiting content width

This page highlights the requirements, instrumentation, and release plan for the collapsible sidebar feature of the Vector skin, as a part of the overall Desktop Improvements project.

Motivation
Two of the main goals of the desktop improvements project are to make it easier for people to focus on the content itself, whether during reading or editing, as well as to highlight important functionality such as the edit and history buttons, language switching, and search.

As a part of this goal, we would like to give readers and editors the flexibility to collapse and uncollapse the left sidebar/menu so that a more focused view of the content, as well as the most important functionality, can be available when needed.

Feature Description and Requirements
The collapsible sidebar feature will introduce a button in the top left corner of the screen. Selecting this button will collapse the sidebar and hide the items within it. To open - press the button again.

If logged-in, your sidebar collapsing preference will be saved. This means that if you chose to have the sidebar collapsed, and then end your session, your sidebar will still be collapsed when you start a new session, and vice-versa.

For logged-out users, the preference will only be saved within a given browser window.

Design Requirements and Guidelines
Please visit https://di-collapsible-sidebar-5.firebaseapp.com/Hathor for a prototype of this functionality

Constraints
Currently, a few projects (such as Korean Wikipedia) already implement similar behavior by default. We would like to work closely with the communities of these wikis to ensure there are no bugs or other issues with sidebar collapsing.

If your wikis are currently using a gadget for collapsing the sidebar, please contact us.

With editors
We performed a feedback round with a prototype of the collapsible sidebar with editors across multiple wikis. Editors were invited to explore the prototype and provide their feedback using a central notice banner. The majority of users who provided feedback liked the collapsed sidebar for personal use, and especially for the purposes of reading. Please read through our report for more details on feedback, concerns raised, and iterations.

With readers
A prototype of the sidebar was also tested with readers through a user study done in collaboration with an independent user testing firm, Hureo, based in India. During the course of the study, we studied readers unfamiliar with Wikimedia projects, as well as casual readers who use Wikimedia projects regularly. The tests were performed in English, Hindi, Telugu, Tamil and Marathi.

Readers reported a strong preference towards the collapsed version of the menu, stating that it created a better reading experience than the current version.

We will be publishing the full results of this study soon.

Quantitative Testing
Once deployed, we are planning a series of quantitative tests on the collapsible sidebar which will help us determine the success or failure of the feature. In particular, we will be focusing on the following questions:


 * Does introducing a collapsible sidebar lead to a significant increase to sidebar links
 * In what ways is the sidebar used - do people have it open or closed for the majority of the time.

Release Plan
We are hoping to deploy this change to office wiki and test wiki in June 2020, followed by the test wikis in late June/early July 2020. See our timeline for more details.