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Request: Restore CJS support — Jest cannot use native <code>require(esm)</code>, blocking NestJS + SSR use cases

Status: Open.

#2051 In capricorn86/happy-dom;

· jacquesg opened on Jan 29, 2026

Performance: Avoid array slicing during DOM traversal

Status: Open.

#2046 In capricorn86/happy-dom;

· TrevorBurnham opened on Jan 24, 2026

Performance: Use structuredClone instead of JSON.parse(JSON.stringify(obj))

Status: Open.

#2045 In capricorn86/happy-dom;

· TrevorBurnham opened on Jan 24, 2026

CSS background property with RGBA linear gradients returns empty string

bugSomething isn't workingSomething isn't working

Status: Open.

#2042 In capricorn86/happy-dom;

· Aziz-JH opened on Jan 23, 2026

querySelector fails to match attribute values containing apostrophes

Status: Open.

#2034 In capricorn86/happy-dom;

· JalilArfaoui opened on Jan 22, 2026

Replace custom HTMLParser with parse5

Status: Open.

#2031 In capricorn86/happy-dom;

· TrevorBurnham opened on Jan 22, 2026

Flaky test: Timeout in DetachedWindowAPI

Status: Open.

#2022 In capricorn86/happy-dom;

· TrevorBurnham opened on Jan 21, 2026

Flaky test: Cache revalidation race condition

Status: Open.

#2013 In capricorn86/happy-dom;

· TrevorBurnham opened on Jan 20, 2026

Performance: Cache match results in nth-child/nth-last-child selector loops

Status: Open.

#1987 In capricorn86/happy-dom;

· TrevorBurnham opened on Jan 17, 2026

Docs improvement suggestion

Status: Open.

#1962 In capricorn86/happy-dom;

· bradvogel opened on Dec 5, 2025

HTMLTemplateElement.insertBefore() redirects to template.content instead of adding direct children

bugSomething isn't workingSomething isn't working

Status: Open.

#1961 In capricorn86/happy-dom;

· ianlet opened on Dec 2, 2025

Doesn't support splitting.js

bugSomething isn't workingSomething isn't working

Status: Open.

#1959 In capricorn86/happy-dom;

· stevenvachon opened on Nov 28, 2025