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tech 8 July 2026

When a Bug Only Affects Left-Handed Users

Discover the intriguing story of a bug that eluded right-handed vigilance and what it reveals about the importance of testing for all users.

Article inspired by the original source
A bug which only affected left-handed users ↗ shkspr.mobi

The Left-Handed User Conundrum

Imagine a bug that affects only a minority of users, a minority often overlooked during software testing: left-handers. This is precisely what happened on Terence Eden's blog. The bug in question caused a comment field to appear frustratingly when a left-handed user scrolled the page with their left thumb.

The Origin of the Bug

In 2017, a developer added a touchstart listener to improve link responsiveness on touch devices. Although this practice was useful at a time when browsers struggled to differentiate between a click and a double-tap, it was already outdated by 2015. Yet, this code persisted, creating a frustrating user experience for left-handers.

Left-Handers, a Neglected Minority

Statistics show that about 10% of the world's population is left-handed. This means that the majority of user testing and interfaces are designed with right-handers in mind. This bug is a crucial reminder of the importance of testing software with a diverse user base to avoid digital biases.

The Cost of Ignorance

Failing to consider the specific needs of certain user groups can have economic consequences. A Forrester report highlights that 70% of companies investing in user experience see an increase in revenue. Ignoring left-handers is potentially neglecting a market share.

The Resolution and the Future

The bug was fixed by Terence Eden simply by removing a few redundant lines of code. However, this underscores the necessity for developers and companies to regularly review their code to ensure it is up-to-date and inclusive.

Conclusion

This story is a lesson on the importance of inclusivity in software development. By considering all users, companies can not only avoid frustrating bugs but also open the door to new opportunities. Let's discuss your project in 15 minutes.

bug left-handed user experience software testing inclusivity
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