It can receive input and create output. The browser is the interpreter for scrip...

smt88 · on Oct 19, 2020

HTML by itself can't receive input or create output. It is input/output. It can't run or be executed. It doesn't transform state or even have state. It's not Turing complete.

HTML with either CSS3 or JavaScript is definitely a program, though.

echlebek · on Oct 19, 2020

> HTML by itself can't receive input or create output.

Neither can an ELF binary. It needs a loader to execute it.

> It can't run or be executed.

Yes it can, with a runtime that understands HTML.

> It doesn't transform state or even have state. It's not Turing complete.

That's not a requirement for a program.

smt88 · on Oct 19, 2020

So what is your definition of a program? It sounds like you're using a definition that's so broad, it would include image files, MP3s, and .gitignore.

username90 · on Oct 19, 2020

You can write an entire game like super mario in an html file. Is a super mario game not a program? And no, this is not an archaic way to use html files, it is pretty common to share smaller games as html files. You play them by loading them into your browser.

Remember that html files are not just html. The way we use them today they are fully functional programs.

smt88 · on Oct 19, 2020

You are arguing against a statement I didn't make. Look back at the last sentence of my original comment[1] where I distinguished HTML from HTML+CSS3+JS.

It seems we agree that HTML (a language, not a file that also includes other languages) cannot create a game like Mario or even Pong.

1. https://news.ycombinator.com/item?id=24826670

morganvachon · on Oct 19, 2020

"HTML by itself can't receive input or create output."

So GET and POST are figments of my imagination then?

chillingeffect · on Oct 19, 2020

Those are HTTP I believe.

Jarwain · on Oct 19, 2020

Http verbs which can be sent from html

smt88 · on Oct 19, 2020

Except that you can "run" (display) an HTML document without ever sending any HTTP requests. The HTML has no power to send one. It just tells you what happens if a user clicks a UI element.

Saying that HTML can send HTTP messages is like saying that HATEOAS API responses[1] can send HTTP messages. They can't without a separate program (written in a non-HTML language) to interpret the HTML and send the message.

1. https://restfulapi.net/hateoas/

tzs · on Oct 19, 2020

> HTML with either CSS3 or JavaScript is definitely a program, though

Then so is something in HTML that doesn’t use CSS3 or JavaScript, for the same reason that a C program that contains no loops is still a program.

smt88 · on Oct 19, 2020

> for the same reason that a C program that contains no loops is still a program

HTML is not "C without loops". It is, by definition, a subset of the string type. All HTML is a string, but not all strings are HTML.

The following is valid C, but I would absolutely argue that it isn't a program:

    char str[] = "Geeks";

It's a declaration, just like HTML is. It is a string that is being declared and stored.

Still, that C example is more of a program than any HTML is because it contains an instruction. It manipulates memory.

HTML is literally just a file format. It is not any more of a program than a PNG file is.