Are you serious right now?
You can look up in relation to programming
stream and find the following definition:
transmit or receive (data, especially video and audio material) over the Internet as a steady, continuous flow.
There is no need to separate that for any sort of download, as should be obvious from that definition. Each one of those connections its own separate communication stream to be rendered in the browser as indicated by the tags.
And the word asset is not "misused", but a standardly accepted term to refer to anything linked from the web page, whether it's external CSS, images, fonts, video, etc.
I have no idea what you mean about "telegram style", other than to toss it out as an aspersion to the fact that I like to get to the point of the matter. I'm not a long-form writer when it isn't needed, i.e. I don't throw words at something to get my point across, but try to make things as succinct as possible and elucidate complex subjects, knowing that people don't necessarily have time to read multi-page treatises on a simple subject. To bastardize a phrase by Einstein,
Any intelligent fool can obscure his speech with words to make explanations longer and more complex ... it takes a touch of genius -- and a lot of courage -- to move in the opposite direction.