1587577 - Remove support for the mfenced element

Status: RESOLVED FIXED

(Core :: MathML, task)

Description

[Frédéric Wang (:fredw)]

MathML Refresh CG agreed to remove it from MathMl Core. https://github.com/mathml-refresh/mathml/issues/2

The current implementations has numerous bugs. The see also list open bugs.

mfenced is supposed to behave exactly like an equivalent mrow+mo, but that's not the case in Gecko as demonstrated with this JS polyfill: https://mathml-refresh.github.io/mathml-polyfills/mfenced (pages should normally render the same after loading the polyfill).

Comment 1

[Frédéric Wang (:fredw)]

Attachment: data-collection-mathml-mfenced-element.txt

Comment 2

[Ben Miroglio [:bmiroglio]]

Comment on attachment 9099995 [details]
data-collection-mathml-mfenced-element.txt

# Data Review Form 

1) Is there or will there be **documentation** that describes the schema for the ultimate data set in a public, complete, and accurate way? 

This will be documented in the [probe dictionary](https://telemetry.mozilla.org/probe-dictionary/).

2) Is there a control mechanism that allows the user to turn the data collection on and off? (Note, for data collection not needed for security purposes, Mozilla provides such a control mechanism) Provide details as to the control mechanism available.

Yes, users can toggled this off by disabling Telemetry in the Firefox Preferences.

3) If the request is for permanent data collection, is there someone who will monitor the data over time?

:fredw will monitor this data, however collection is only proposed for 6 months initially.

4) Using the **[category system of data types](https://wiki.mozilla.org/Firefox/Data_Collection)** on the Mozilla wiki, what collection type of data do the requested measurements fall under?

Category 1: Technical Data

5) Is the data collection request for default-on or default-off?

default-on

6) Does the instrumentation include the addition of **any *new* identifiers** (whether anonymous or otherwise; e.g., username, random IDs, etc.  See the appendix for more details)?

No.

7) Is the data collection covered by the existing Firefox privacy notice? **If unsure: escalate to legal if:**

Yes.

8) Does there need to be a check-in in the future to determine whether to renew the data?

No.

9) Does the data collection use a third-party collection tool? **If yes, escalate to legal.**

No.

data-review: r+

Comment 3

[Frédéric Wang (:fredw)]

Attachment: Bug 1587577 - Remove support for the mfenced element. r=emilio

WIP

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/52a520cb41e2
Remove support for the mfenced element. r=emilio

Comment 5

[Cristina Coroiu [:ccoroiu]]

https://hg.mozilla.org/mozilla-central/rev/52a520cb41e2

Comment 6

[Kohei Yoshino]

Updated the site compatibility note.

Comment 7

[Florian Scholz (Open Web Docs)]

Updated:
https://developer.mozilla.org/en-US/docs/Web/MathML/Element
https://developer.mozilla.org/en-US/docs/Web/MathML/Element/mfenced

Please add 'dev-doc-needed' to the bug that removes this in a stable Firefox version.