1054910 - Tables in MathJax are incorrectly aligned

Status: NEW

(Core :: JavaScript Engine, defect)

Description

[di.gama]

Attachment: Screenshot of table

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 (Beta/Release)
Build ID: 20140815030202

Steps to reproduce:

Visit http://www.mathjax.org/demos/tex-samples/, or run MathJax on

$$\mathbf{V}_1 \times \mathbf{V}_2 =  \begin{vmatrix}
\mathbf{i} & \mathbf{j} & \mathbf{k} \\
\frac{\partial X}{\partial u} &  \frac{\partial Y}{\partial u} & 0 \\
\frac{\partial X}{\partial v} &  \frac{\partial Y}{\partial v} & 0
\end{vmatrix}$$


Actual results:

The table in the display is aligned to the first row, instead of centered vertically, so there is a large white space above the table


Expected results:

The table should be aligned to vertical center

Comment 1

[di.gama]

This bug was also reported at MathJax:

https://github.com/mathjax/MathJax/issues/891

but since it only occurs on my Firefox Nightly 34.0a1 build, they suggested that I report it here.

Comment 2

[Alice0775 White]

[Tracking Requested - why for this release]: regression

Regression window(m-c)
Good:
https://hg.mozilla.org/mozilla-central/rev/a4dcfbebcb58
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140728034717
Bad:
https://hg.mozilla.org/mozilla-central/rev/70b3fc807a70
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140728063421
Pushlog:
http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=a4dcfbebcb58&tochange=70b3fc807a70

Regression window(m-i)
Good:
https://hg.mozilla.org/integration/mozilla-inbound/rev/ca1c3ca7d314
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140725154409
Bad:
https://hg.mozilla.org/integration/mozilla-inbound/rev/eb01c53fd879
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140725155048
Pushlog:
http://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=ca1c3ca7d314&tochange=eb01c53fd879

Comment 3

[Alice0775 White]

In local build
Last Good: 5edaa0a67cb8
First Bad: 22cfcffb5a8b

Triggered by:
  22cfcffb5a8b	Andy Anderson — Bug 369778 - RegExp capturing groups that aren't matched during a match (because of, say, a *?+{n}{n,m} quantifier that means they're never used) should be matched as |undefined|, not as the empty string. r=jwalden

Comment 4

[Till Schneidereit [:till]]

I commented in the MathJax issue: https://github.com/mathjax/MathJax/issues/891#issuecomment-52482708

Comment 5

[Benjamin Kerensa [:bkerensa]]

So is this on our side or theirs?

Comment 6

[Till Schneidereit [:till]]

(In reply to Benjamin Kerensa [:bkerensa] from comment #5)
> So is this on our side or theirs?

I'm not yet entirely sure. I thought it was certain to be on their side, but now I think it might be bug 1053944, and thus something we might/could work on on our side.

Comment 7

[di.gama]

Update: This bug has been patched and fixed on the MathJax end, so if it is deemed that there is nothing Mozilla aught to do about this bug then it's probably safe to close.

Comment 8

[Till Schneidereit [:till]]

Thanks, di.gama. Given that we encountered more breakage through the RegExp.$N behavior change, we still might revert that. Still, it's good to hear that you were able to work around the issue on your end.

Comment 9

[Benjamin Kerensa [:bkerensa]]

Not tracking based on Comment 7