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About DOCTYPE
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Question
DOCTYPE is not a case sensitive right
Then why you told it should be in capital letters

HTML My-first-HTML-program 01-02 min 0-10 sec 16-06-21, 12:02 p.m. Vanikallesh

Answers:

Though it is not case sensitive, writing it in caps is the universal way.
You can write it in any way. 
28-06-21, 12:05 p.m. pravin1389

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It is the universal way

15-09-21, 7:53 p.m. shaikhfaizal0602@gmail.com

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All HTML documents must start with a <code class="w3-codespan" style="box-sizing: inherit; font-family: Consolas, Menlo, &quot;courier new&quot;, monospace; font-size: 15.75px; color: crimson; background-color: rgba(222, 222, 222, 0.3);"><!DOCTYPE></code> declaration.

The declaration is not an HTML tag. It is an "information" to the browser about what document type to expect.

In HTML 5, the declaration is simple: <span class="tagcolor" style="box-sizing: inherit; color: mediumblue; font-family: Consolas, Menlo, &quot;courier new&quot;, monospace;"><</span><span style="color: rgb(165, 42, 42); font-family: Consolas, Menlo, &quot;courier new&quot;, monospace;">!DOCTYPE</span><span class="attributecolor" style="box-sizing: inherit; color: red; font-family: Consolas, Menlo, &quot;courier new&quot;, monospace;"> html</span><span class="tagcolor" style="box-sizing: inherit; color: mediumblue; font-family: Consolas, Menlo, &quot;courier new&quot;, monospace;">></span>

04-03-22, 12:21 p.m. Jagruti_08

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