Weekly Platform News: Feature Policy, Signed Exchanges, iOS browsers

This week's web development news covers key updates impacting development standards and browser tools. Šime Vidas from webplatform.news curates these updates.

Chrome's Feature Policy Enhancements:

Andrew Betts highlights the HTTP Feature-Policy response header. Websites can leverage this to prevent third-party misuse of features like geolocation and disable problematic practices (e.g., document.write, blocking JavaScript, unoptimized images). This fosters better web practices, potentially influencing search engine rankings. Further details are available at featurepolicy.info.

Signed Exchanges on Google Search:

Google Search now supports Signed HTTP Exchanges (SXG) for AMP pages on mobile. Using Chrome for Android, users see AMP pages loaded from Google's servers, but the experience mimics a normal website visit. This speeds up loading while maintaining content control. The AMP Packager handles server-side support, and Cloudflare's "AMP Real URL" automates the signing process for pages served via their CDN. More information is on the Google Webmaster Central Blog.

iOS Browser Limitations:

Henrik Joreteg points out significant API restrictions for alternative iOS browsers compared to Safari. Service workers, web payments, and camera access are often unavailable. Chrome on iOS, for example, lacks full functionality, using a custom implementation for web payments. An HTML5test browser support table illustrates these discrepancies.

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