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[CLOSED LAST MONTH]Is the <!DOCTYPE html> needed?

I wonder if i could do it like here: https://codepen.io/CatMan10/pen/EOYqwV Does it matter at all? Thank You for the feedback!👌😊😉 Edit: White to a black cat is my account.

4th Nov 2018, 10:44 PM
Potato Hacker
Potato Hacker - avatar
3 ответов
+ 5
You can do so. Doing so would mean that you are using HTML4 instead of HTML5, which means you cannot use things like <frame>, <marquee>, <nav>, and several others
4th Nov 2018, 11:28 PM
👑 Prometheus 🇸🇬
👑 Prometheus 🇸🇬 - avatar
+ 2
⏩ Prometheus ⏪ Eek, marquee is Deppricated in HTML 5
6th Nov 2018, 2:08 AM
Potato Hacker
Potato Hacker - avatar