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Servo's implementation of Sniffing in a style context

addition/proposalNew features or enhancementsNew features or enhancements

needs testsMoving the issue forward requires someone to write testsMoving the issue forward requires someone to write tests

topic: mime type sniffing

Status: Open.

#207 In whatwg/mimesniff;

· TimvdLippe opened on Jan 22, 2026

Are the abbreviations 0xTT and OxWS necessary?

Status: Open.

#206 In whatwg/mimesniff;

· evilpie opened on Jan 21, 2026

Some browsers don't sniff <!-- not followed by space or > as per standard

compatStandard is not web compatible or proprietary feature needs standardizingStandard is not web compatible or proprietary feature needs standardizing

interopImplementations are not interoperable with each otherImplementations are not interoperable with each other

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

Status: Open.

#205 In whatwg/mimesniff;

· valenting opened on Jan 21, 2026

Pattern for <code>application/vnd.ms-fontobject</code> prone to false-positives

needs concrete proposalMoving the issue forward requires someone to figure out a detailed planMoving the issue forward requires someone to figure out a detailed plan

needs testsMoving the issue forward requires someone to write testsMoving the issue forward requires someone to write tests

topic: mime type sniffing

Status: Open.

#203 In whatwg/mimesniff;

· silverwind opened on Jan 14, 2026

Don't use "MIME"

editorialChanges that do not affect how the standard is understoodChanges that do not affect how the standard is understood

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

Status: Open.

#195 In whatwg/mimesniff;

· martinthomson opened on Dec 4, 2024

Algorithm for determining what is and is not a MIME type seems to be undefined.

topic: mime type

Status: Open.

#194 In whatwg/mimesniff;

· MattMenke2 opened on Sep 10, 2024

Should Mac BinHex be sniffed?

needs concrete proposalMoving the issue forward requires someone to figure out a detailed planMoving the issue forward requires someone to figure out a detailed plan

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

topic: mime type sniffing

Status: Open.

#191 In whatwg/mimesniff;

· yuhong opened on Jun 25, 2024

Web platform tests disagree on how to handle blob content-type validation

needs testsMoving the issue forward requires someone to write testsMoving the issue forward requires someone to write tests

Status: Open.

#189 In whatwg/mimesniff;

· wisniewskit opened on Apr 26, 2024

Some context-specific sniffing algorithms don't check if supplied MIME type is undefined

clarificationStandard could be clearerStandard could be clearer

Status: Open.

#181 In whatwg/mimesniff;

· kemzeb opened on Nov 6, 2023

Various issues in the "Signature for mp3 without id3" algorithm

clarificationStandard could be clearerStandard could be clearer

topic: mime type sniffing

Status: Open.

#168 In whatwg/mimesniff;

· simonwuelker opened on Apr 15, 2023

Confusing step in <code>parse a vint</code>

Status: Open.

#167 In whatwg/mimesniff;

· simonwuelker opened on Apr 15, 2023

Navigating to a text/plain-labeled PNG file

topic: mime type sniffing

Status: Open.

#157 In whatwg/mimesniff;

· annevk opened on Jan 17, 2022