It sounds like you're trying to check the colors via printscreen/screenshot or by a color picker that is in the web browser. This is not a good way to check the colors due to the way programs and computers generate colors, there are a lot of factors that come into play.

I uploaded the SVG file as a attachment in this thread. It doesn't have a permanent URL on commons, you can test the issue by uploading the file to File:Test.svg.

The example I provided above still doesn't render correctly, see attachment.

Thanks @Jarry1250 and @bd808 much appreciated

Just noting the tool is still unresponsive. What is the best way to get a sysadmin to take a look at this?

I know this is a old topic, but wanted to comment on it. In the example you give you want to colorize a speech bubble icon, this can be done already as long as the icons are crafted with this in mind.

When you purge, the comment for the current revision does come back, but after some time passes (a few minutes) it disappears again.

Just to comment, I also support closing this task. As Perhelion said, this element was part of the SVG 1.2 draft, but that was never finalized and was later scrapped. The current standard that was finalized is SVG 1.1 which does not have the flow elements. SVG 2 is being worked on as a potential successor of SVG 1.1, so no reason in asking for support for a element from a now defunct draft.

See Black rectangle (Flowed Text bug), "Chiswick Chap" already uploaded a new revision removing the flow elements, so this ticket can be closed.

SVG files should be validated prior to being uploaded. When you validate the file to make sure it conforms to the SVG standard, a error is generated informing you the flow element is not allowed.

Please read this section on the Help:SVG page. The problem is caused by the use of the non-standard flow elements, remove the flow elements and the black box will not be there.

In T7792#2315213, @Aklapper wrote:

In upstream version 2.40.13,

@Menner added basic support for the "baseline-shift" attribute in text objects. We support "sub", "super", and plain "baseline", so you can at least have subscripts and superscripts for formulas and such. There is no support for percentages or explicit lengths yet. https://bugzilla.gnome.org/show_bug.cgi?id=340047

https://bugzilla.gnome.org/show_bug.cgi?id=760191 tracks supporting baseline-shift via font size percentage and/or explicit length.