[TobiasDuelli]

Problem

Ticket 225583 (Vizzlo): charts are missing from screenshots, and the whole chart area renders blank.

replaceStyleNodes replaced every style sheet without readable rules with <link rel="stylesheet" href={styleSheet.href}>. For an inline <style> with no rules, href is null, which gives <link … href="null">. Inside an <svg>, outerHTML writes that HTML <link> without an end tag. When the renderer re-parses it in svg (foreign content), link is not void, so everything after it in the svg is nested inside it and not painted. This code is unchanged since v6.0.0.

Fix

A sheet without an href (inline) now always takes the existing <style> branch, with its readable rules, or empty when it has none. That is the same "no CSS" result the null link gave, without breaking the svg. Sheets with an href and unreadable rules (cross-origin) still fall back to a <link>. Side effect: the renderer no longer requests <base>/null for empty <style> tags in the head.

Commit 2 is the usual version bump: 19.3.3, CHANGELOG, build/, published/19.3.3/, published/latest/.

Verification

• New jest test (fails on master); full suite 572/572 green.
• Real Chromium, bundled ScreenCapture.js, old vs new:
  • The svg keeps all its children (bar 200px wide vs 0).
  • No href="null" anywhere.
  • CSS rules deleted via CSSOM are not revived.
  • A cross-origin <link> stays a <link>.
• Chromium matrix (old/new SDK × old/new renderer): only old SDK + old renderer is blank.
• The renderer fix (GleapSDK/Server-HTMLtoImage, branch fix-225583-svg-empty-style) covers captures from older SDKs; this PR also covers svg inside same-origin iframe srcdoc, which the renderer change doesn't reach.
• 4 independent reviews (parity, consumers, architecture, release risk) + verifier: no blockers.

Release

Merge (deploys the CDN), then git tag 19.3.3 && git push origin 19.3.3 for npm.

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