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Add lightning to the safelisted schemes list

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom protocols

Status: Open (in progress).

whatwg/htmlnumber 11649

#11649 In whatwg/html;

· asoltys opened on Sep 10, 2025

Add openid4vp: as a safelisted scheme for protocol registration handling

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom protocols

Status: Open.

#11552 In whatwg/html;

· nvoutsin opened on Aug 13, 2025

Add "callto" to the safelisted schemes

topic: custom protocols

Status: Open.

#9894 In whatwg/html;

· Draginfable opened on Oct 30, 2023

Consider a different process for standardizing registerProtocolHandler schemes

metaChanges to the ecosystem around the standard, not its contentsChanges to the ecosystem around the standard, not its contents

topic: custom protocols

Status: Open.

#9158 In whatwg/html;

· zcorpan opened on Apr 13, 2023

Add payto as a safelisted scheme for registerProtocolHandler()

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom protocols

Status: Open (in progress).

whatwg/htmlnumber 9155

#9155 In whatwg/html;

· rastislavcore opened on Apr 12, 2023

Add payto to registerProtocolHandler safe listed schemes

topic: custom protocols

Status: Open.

#9154 In whatwg/html;

· rastislavcore opened on Apr 12, 2023

Don't mangle """username""" and """password""" in "web+" protocol handlers

security/privacyThere are security or privacy implicationsThere are security or privacy implications

topic: custom protocols

Status: Open.

#8697 In whatwg/html;

· SoniEx2 opened on Jan 8, 2023

Support empty URL in registerProtocolHandler

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom protocols

Status: Open.

#8665 In whatwg/html;

· SoniEx2 opened on Jan 3, 2023

Require user gestures to accept registerProtocolHandler request

topic: custom protocols

Status: Open.

#7797 In whatwg/html;

· javifernandez opened on Apr 6, 2022

interop issues in protocol handler manual tests due to url encoding

topic: custom protocols

Status: Open.

#7703 In whatwg/html;

· javifernandez opened on Mar 14, 2022

Add notes to the safelisted schemes list

addition/proposalNew features or enhancementsNew features or enhancements

needs implementer interestMoving the issue forward requires implementers to express interestMoving the issue forward requires implementers to express interest

topic: custom protocols

Status: Open (in progress).

whatwg/htmlnumber 7678

#7678 In whatwg/html;

· DConmy opened on Mar 3, 2022

Consider making (un)registerProtocolHandler asynchronous

topic: custom protocols

Status: Open.

#5845 In whatwg/html;

· fred-wang opened on Aug 19, 2020