HTML comments <!...> Or <!--...--> ?

Question

As per many textbook's HTML comments are as follows
<! comment section >
but in sololearn and some other websites it is as follows
<!-- comment section -->
which is the correct one????

Answer 1

The correct HTML comment is the 2nd one <!-- ....... -->

Answer 2

It should be <!--(blah blah blah)--> For some reason, maybe because they dont use traditional HTML

Answer 3

First, since Internet Explorer deviates so much, their conditional comments are technically invalid for XML compliance standards as well as HTML's.

Now my message: To be more correct, possibly off-topic, following up on the other two comments I see, I'm going to use my knowledge of XML in this (just in case you want an XML parser to validate the comments...).

Comments start with "<!--" and ends with the FIRST instance of "-->" that is found, so nesting comments will produce invalid code. There must be absolutely ZERO instances of "--" between the start and there must be ZERO extra "-" after the start or before the end. Examples for the start of a comment."<!---" three dashes/hyphens or more is invalid, but "<!-- -" having a space or other valid character BEFORE a dash/hyphen spree is okay.

Answer 4

this one is correct comment<!--comment-->

Answer 5

thé second one <!-- blablabla -->

Answer 6

the second option Is the correct <!--...-->

Answer 7

in html <!--comments allow--> is valid comment

Answer 8

@Malcolm Crowley, your iOS device is automatically converting them from - - to either — or – which means you should look in the system's settings and disable any auto-correct or similar features while using SoloLearn.

Answer 9

I’m stuck in the program at this test, valid answer coming back as invalid. </!— comments —>. For some reason on my ipad pro, the hyphens are entered look like a line as in the instructions i typed.

Answer 10

<!__This is comment__