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Request.formData() fails on string body with explicit Content-Type header

bugSomething isn't workingSomething isn't working

Status: Open.

#2106 In capricorn86/happy-dom;

· brianhelba opened on Mar 17, 2026

CSSStyleDeclaration.setProperty function incorrectly interacts with null

bugSomething isn't workingSomething isn't working

Status: Open.

#2100 In capricorn86/happy-dom;

· Bob-chemist opened on Mar 12, 2026

Timeout and PROMISE leaks reported by vitest 4.1-beta --detect-async-leaks are unfixable from userland

bugSomething isn't workingSomething isn't working

Status: Open.

#2099 In capricorn86/happy-dom;

· jtnix opened on Mar 11, 2026

MutationObserver seems broken with vitest's fake timers since 20.3.3

bugSomething isn't workingSomething isn't working

Status: Open.

#2097 In capricorn86/happy-dom;

· neovov opened on Mar 9, 2026

XMLHttpRequest does not implement instance-level readyState enums

bugSomething isn't workingSomething isn't working

Status: Open.

#2096 In capricorn86/happy-dom;

· kettanaito opened on Mar 9, 2026

File is missing webkitRelativePath

bugSomething isn't workingSomething isn't working

Status: Open.

#2093 In capricorn86/happy-dom;

· wondenge opened on Mar 4, 2026

removeEventListener ignores the capture parameter

bugSomething isn't workingSomething isn't working

Status: Open.

#2089 In capricorn86/happy-dom;

· wondenge opened on Mar 2, 2026

querySelector throws SyntaxError on selectors containing CSS hex escapes (e.g. #\39 7e...)

bugSomething isn't workingSomething isn't working

Status: Open.

#2088 In capricorn86/happy-dom;

· lukebolandt1 opened on Mar 2, 2026

20.6.3 Regression - Unable to find role

bugSomething isn't workingSomething isn't working

Status: Open.

#2087 In capricorn86/happy-dom;

· michael-wolfenden opened on Mar 2, 2026

[Bug]: Click events on nested <span> inside <button type="submit"> fail to trigger form submission (Activation Behavior regression since v15.0.0)

bugSomething isn't workingSomething isn't working

Status: Open.

#2081 In capricorn86/happy-dom;

· mksawic opened on Feb 26, 2026

:not selector followed by Brackets in next attribute selector value triggers selector validation error

bugSomething isn't workingSomething isn't working

Status: Open.

#2077 In capricorn86/happy-dom;

· jotoh98 opened on Feb 23, 2026

EventTarget.addEventListener throws TypeError due to uninitialized internal listener maps

bugSomething isn't workingSomething isn't working

Status: Open.

#2064 In capricorn86/happy-dom;

· ViniciusFXavier opened on Feb 16, 2026