Weekly Platform News: Text Spacing Bookmarklet, Top-Level Await, New AMP Loading Indicator

This week's web development news covers a helpful bookmarklet for typography analysis, using await to manage JavaScript module imports, and the deceptive nature of Facebook's in-app browser. Let's dive in!

Easily Check Text Spacing Impacts on Your Website

Deque's Dylan Barrell has developed a convenient bookmarklet to assess how changes in line, paragraph, letter, and word spacing affect your website's content and functionality. This tool is invaluable for ensuring compliance with Web Content Accessibility Guidelines' "Text Spacing" success criterion.

(via Dylan Barrell)

Top-Level Await: Revolutionizing JavaScript Module Interaction

The proposed top-level await feature significantly improves JavaScript module management. If module A uses top-level await (for tasks like database connections), and module B imports A, B's execution waits for A's completion. This allows modules to function as large asynchronous operations.

Top-level await transforms ESMs into essentially large async functions, enabling them to await resources and ensuring dependent modules wait before execution.

(via Brian Kardell)

AMP's Enhanced Loading Indicator Boosts Perceived Performance

AMP's new multi-stage loading indicator enhances perceived performance (verified with 2,500 users). It strategically delays visual cues: nothing until 0.5s, then an intermediate animation until 3.5s, and finally a spinner.

(via Andrew Watterson)

Other Notable News…

• AMP's <amp-script></amp-script> element now allows custom JavaScript (with limitations: separate worker thread, user gesture required for content changes) (via AMP Project).
• The HTML Standard now designates autofocus as a global attribute, applicable to all elements, not just form controls (though browser support is pending) (via Kent Tamura).
• Facebook's WebView-based in-app browser isn't a true browser, negatively impacting web accessibility for a significant portion of users (via Alex Russell).

For more weekly web platform news, check out the Sunday issue at webplatform.news.

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