Rendering engine version

[imaretic]

Despite OGrafs being defined by this specification, they can still render differently across different “OGraf renderers” since not every “OGraf renderer” will be using the same version of HTML rendering engine (Blink, Gecko, etc.), where differences in support for specific HTML, CSS, or JS features can occur. It would be useful to include the minimum compatible engine version for the template in the manifest file because the choice of rendering engine directly affects how OGrafs are displayed. This requirement could potentially be added to the RenderRequirement object of the manifest file.

Since CEF is commonly used in video production software, we should consider whether it makes sense to specify minimum CEF version requirements only, or whether the manifest should remain flexible enough to support defining minimum versions for other rendering engines as well.

[nytamin]

I think we should include the CEF-version in the version descriptor, to allow for potential other rendering engines in the future.
Something like this, perhaps?

{
    "renderRequirements": [
        {
            "engine": {
                "cefVersion": { "min": 139 }
            }
        }
    ]
}

[didikunz]

What about:

{
    "renderRequirements": [
        {
            "engine": {
                "type": "CEF",
                "version": { "min": 139 }
            }
        }
    ]
}

Would allow other engines, like Gecko etc.

[herzogmedia]

The original proposal would do so as well, when used like so:

{
    "renderRequirements": [
        {
            "engine": {
                "cefVersion": { "min": 139 },
                "geckoVersion": { "min": 106 }
            }
        }
    ]
}

That said, I would still prefer @didikunz 's version, since it is a bit more verbose.

[didikunz]

Or a combination of both:

{
    "renderRequirements": [
        {
            "engine": [
				{
					"type": "CEF",
					"minVersion": 139
				},
				{
					"type": "Gecko",
					"minVersion": 106
				}
			]
        }
}

The version could always be a minimal version, so that could be shorthanded, or could left as is for compatibility with other numeric values, that have a range etc. In this way different engines could be mention, without having fixed assomptions on types. So it could also be vendor specific types.

[didikunz]

What we discussed during the meeting on 2025-10-29:

{
    "renderRequirements": [
        {
            "engine": [
				{
					"type": "CEF",
					"version": { "min": 139 }
				},
				{
					"type": "Gecko",
					"version": { "min": 106 }
				}
			]
        }
}