Don't use object tag (for SVGs)

[rugk]

In order to make it good for a CSP (#3632) a big thing is just to remove that object tag. It is usually used to embed flash or other "active content", which nobody uses anymore, so in order to block flash and other nasty things, you have not use the object tag

I also don't see any reason. SVGs are images, so use svg.

I read this and maybe you use it to manipulate them from teh outside? In this case, BTW, you can always just embed the SVG itself in the HTML, which is a nicer solution than using object.

[ara4n]

the reason we use <object/> is to allow the SVG CSS to be manipulated from the outside in order to tint. I'm unclear why embedding SVG directly in the DOM any better?

[rugk]

It would be good for #3632, i.e. for creating a strong CSP. Images (img tag) are covered by img-src there, and of course allowed for self.
To allow the object tag, we have to allow them using object-src. object-src, however, includes many things, which are not used by Riot, including flash plugins and stuff like that. Google's CSP validator also always complains if you specify a CSP and set no value for object-src, pointing out that this should be disallowed and may also be used to bypass the CSP, because of course flash or Java or whatever plugins, do not abide the CSP. (don't know the details here, how they act with same origin, but the general thing is just: we don't want plugins…)

[lampholder]

Admittedly I'm fairly uncomfortable triaging this one - please discuss vigorously if you think feature p4 security == "an interesting idea for a feature that possibly/probably has merit but we'd need to think more about before accepting a PR from the community and certainly isn't on our immediate roadmap to address" is not appropriate :)

[ara4n]

working towards a stronger CSP is certainly a good thing, and I don't think I experimented with embedding SVGs straight into the DOM at the time (which may also have other desirable perf benefits), so I think this is worth prioritising higher.

Not sure how relevant this is there, but currently i am forced to use to solve my issue with appendChild. There is my issue from StackOverflow.