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more web things

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posts/everthing-I-know-web.md
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@ -63,11 +63,60 @@ Now you may be wondering?
Anyways.
### HTTP body
The HTTP body is the main content of a response.
The file content, the API respose, etc.
### HTTP trailers
HTTP trailers are pretty obscure.
If they weren't used for [Server-Timing](https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Server-Timing) debugging information (based on MDN) and gRPC nobody would use them.
My understanding is that they are HTTP headers which in the TCP/TLS/QUIC socket connection come after the HTTP body
## HTML
Platonically ideal HTML exists to communicate content in a way which computers can understand which web browsers then translate into something humans can interpret and interact with.
HTML is a text format which looks like the following.
```html
<html>
<!--whitespace in HTML is janky but this example behaves the way you'd expect-->
<head></head>
<body>
<h1 id="greeting">hello</h1>
</body>
</html>
```
I am not going to go into the details of every single tag, all I'll say is that barring tags like `div`, `span` and anything custom, tags generally convey useful information about their contents which are mainly used by screen readers and search engines but can be used by anything else.
I will try to explain my understanding of `head` and `body` though
### The `head` Tag
The `head` tag is for information which doesn't exist primarily to be shown in the main view.
It has the web page's title, various metadata for things like RSS feed(s), the text encoding being used, CSS stylesheets and social media embed information.
That isn't to say you can't make stuff in `head` visible in the main view or that all of those things can only be done in `head`.
However you shouldn't make stuff in `head` visible in the main view and should do those things in `head` if you can.
There are situations where that isn't an option but those situations involve needing to run code when the page is done loading and have the page work on old browsers.
Reason that trick would be necessary is that browsers will (barring certain element attributes) process HTML in the order it appears in.
### The `body` Tag
The `body` tag is where all the fun human visible stuff should go.
That doesn't mean it's all visible to humans though.
### HTML is not XML
Forgetting that will lead to footguns like `<video src="..." />` making certain tags their children even though you didn't want them to.
The slash doesn't do anything for elements you can omit a closing tag from either, `<img src="...">` is just fine.