<p><strong>TLDR:</strong> Bun’s next release cuts ES module load times by up to 2.4x, which is a meaningful win for anyone running large module graphs. On the CSS side, a batch of features including anchor positioning, <code>@scope</code>, and <code>shape()</code> have reached cross-browser baseline as of this month. Cloudflare and Cypress both shipped MCP integrations this week, and the approaches they landed on say something interesting about where agent tooling is heading. React Navigation 8.0 alpha also dropped with native bottom tabs and reworked TypeScript inference.</p>
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<h2>Bun’s next version loads ES modules up to 2.4x faster</h2>
<p>The Bun team announced that the upcoming release will load ES modules up to 2.4x faster. No detailed breakdown of what changed yet, but for projects with deep dependency trees or large module counts, this is the kind of improvement that shows up immediately in cold start times. Worth watching the release notes when it ships.</p>
<h2>CSS anchor positioning and @scope reach cross-browser baseline</h2>
<p>A solid batch of CSS features crossed the cross-browser baseline line between October 2025 and April 2026, meaning they’re safe to use in production today without polyfills. The headliners are anchor positioning (native tethering for tooltips, popovers, and dropdowns), <code>@scope</code> for selector scoping and donut-hole cascade control, name-only container queries, the <code>shape()</code> function for responsive geometry, <code>light-dark()</code> support for image values, <code>view-transition-class</code> for SPA-style routing animations, and new root-relative typographic units like <code>rcap</code> and <code>rch</code>. If you’ve been waiting on any of these, the wait is over.</p>
<h2>Cloudflare and Cypress both shipped MCP integrations this week</h2>
<p>Cloudflare’s API has over 2,600 endpoints. Rather than exposing each as an MCP tool (which would be a context window disaster), they landed on having the agent generate code against a typed SDK, then execute it in an isolated sandbox. The result: full API coverage with minimal token usage. Cypress took a similar direction for accessibility workflows — their MCP server lets agents pull test run metadata and violation summaries from Cypress Cloud, then generate remediation plans without a human manually reading reports. Both approaches share the same insight: you can’t pre-load a large API surface into an agent’s context and expect good results. Dynamic code generation against typed SDKs looks like it might become the default pattern here.</p>
<h2>React Navigation 8.0 alpha is out</h2>
<p>React Navigation 8.0 alpha landed with native bottom tabs, a reworked TypeScript inference system, and changes to navigation history. It’s alpha, so not production-ready, but if you’re maintaining a React Native app this is worth tracking. The TypeScript inference rework in particular could affect how you type your navigation params.</p>
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<h2>Also notable</h2>
<ul>
<li><strong>Kimi K2.6:</strong> Moonshot AI updated their model with 300 specialized agents (up from 100) and a preserve-thinking mode for consistent reasoning across multi-turn tasks — reviewer called it a cheaper Claude Code alternative for agentic workflows, though not a massive leap over K2.5.</li>
<li><strong>Claude in Chrome extension:</strong> Anthropic’s browser extension handles agentic tasks like flight searches and integrates with Claude Code for debugging workflows; it’s included with an existing Claude subscription.</li>
<li><strong>Firefox Labs features:</strong> Firefox added a free built-in VPN (browser-only), tab notes tied to specific URLs, a pomodoro-style to-do list, and split view — all experimental, available under Firefox Labs in settings.</li>
<li><strong>grdpwasm:</strong> Open-source browser-based RDP client built with Go WebAssembly; connects to Windows Remote Desktop servers without plugins, with keyboard/mouse support and remote audio via the Web Audio API.</li>
<li><strong>Avnac:</strong> Browser-based canvas editor using React, Vite, Fabric.js, and IndexedDB for local-first persistence; supports layers, QR code generation, PNG export, and prompt-based edits via a magic panel.</li>
<li><strong>Making apps agent-ready:</strong> A detailed guide covering MCP server setup with JSON-RPC 2.0, OAuth 2.1 with PKCE, protocol discovery endpoints, and content negotiation for Markdown — includes a common pitfall around RLS issues with Bearer tokens.</li>
<li><strong>MockBolt:</strong> Free no-signup mock API tool that generates a live public URL from pasted JSON in under 30 seconds; supports custom status codes, CORS, response delay simulation, and a request inspector with live streaming logs.</li>
</ul>


Frontend development news, CSS techniques, framework updates, and browser API changes.

Web Digest

Bun's upcoming release delivers up to 2.4x faster ES module loading, a significant improvement for projects with large dependency trees. Several CSS features including anchor positioning, @scope, shape(), and view-transition-class have reached cross-browser baseline and are safe for production use. Cloudflare and Cypress both shipped MCP integrations this week, with both adopting a pattern of dynamic code generation against typed SDKs rather than pre-loading large API surfaces into agent context. React Navigation 8.0 alpha is out with native bottom tabs and reworked TypeScript inference. Also covered: Kimi K2.6 model update, Claude's Chrome extension, Firefox Labs experimental features, and several open-source tools including a browser-based RDP client and mock API tool.

Bun ES modules get 2.4x faster, CSS anchor positioning hits all browsers