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When take some tutorial from web, I see many people leaves tags open like <link ..>, <img ..>. But when I use Netbeans to edit them (the HTML/JSP pages), it show a red background on those tags until I add the slash into them. <br> --> <br/>.
Which is the correct way to write HTML-based code?
Both are fine for HTML. Though not for XHTML which is an XML dialect.
Some elements do not need a closing (
/>) tag - in particular empty elements (those that do not have content). Examples are<hr>and<br>. These can also be self closing (<hr />and<br />, respectively). This self closing is equivalent to having a close tag immediately after the open tag.For XML, such a non closing tag is not valid - it must be closed, either self closing or have a closing tag. So
<hr>is not valid XML, but<hr />and<hr></hr>are.HTML is not XML, but for better compatibility some tools try to emit as much XML like HTML as possible.
>is correct forHTML, but incorrect forXHTML. Check your DOCTYPE.for
HTML strictandfor
XHTML strictIt depends which DOCTYPE you're using. If you're using HTML 4 then you shouldn't use self-closing tags, if XHTML then you should to make valid XML, and if HTML 5 then closing slashes are optional, but not required.
The W3C HTML Validator will throw a warning if you try to use closing tags in HTML 4: