Weekly Platform News: Tracking via Web Storage, First Input Delay, Navigating by Headings

This week's web development news highlights Safari's enhanced tracking prevention, the significant disparity in First Input Delay (FID) between mobile and desktop, and the prevalent use of headings for navigation by screen reader users.

Safari Strengthens Tracking Prevention:

Safari is combating cross-site tracking techniques that exploit link decoration and web storage. To counter the use of localStorage as a tracking mechanism, Safari now clears all non-cookie website data after seven days of user inactivity if the user accessed the site via a "decorated" link. This proactive measure aims to neutralize third-party scripts leveraging website storage for tracking purposes.

(Source: John Wilander)

Mobile FID Significantly Lags Behind Desktop:

A concerning trend reveals a substantial difference in First Input Delay (FID) between mobile and desktop experiences. Only 13% of websites achieve fast FID scores on mobile, compared to 70% on desktop. Website owners can utilize PageSpeed Insights (if their site is in the Chrome UX Report) to analyze their site's FID performance across both platforms.

(Source: Rick Viscomi)

Headings: The Primary Navigation Method for Screen Reader Users:

WebAIM's recent survey underscores the importance of proper heading structure for accessibility. NVDA and JAWS lead as primary screen readers on desktop, while VoiceOver and TalkBack dominate on mobile. The survey reveals that a significant majority (86.1%) of screen reader users find well-structured headings very or somewhat useful for navigating web pages. Use W3C's Nu Html Checker (with the "outline" option enabled) to validate your website's heading structure.

(Source: WebAIM)

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