Why does upper/lower case matter?


First lesson - why does upper and lower case impact whether the code will work or not?
when I typed <!doctype HTML> it didn’t work, and I’m just curious as to why.
Thank you!


For discussion / opinions do a google search
html why is doctype in uppercase site:stackoverflow.com

It could be the code-checker of codecademy is checking for the uppercase DOCTYPE

You should also be aware that at this point of time
the HTML standard is becoming HTML5
So you might do a search
html html5 doctype uppercase or lowercase site:stackoverflow.com


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