Revisiting the HTML code I've found interesting tag:
<meta name="mode" content="full" />
Does anynody know what the mode full could stand for?
Rescale to full view on portable devices?
name attribute specifies the name of meta content.
content attribute specifies the list of values that are associate with name attribute.
Check this guide of valid name Meta Documentation
So as per my knowledge is name=mode and content=full is not valid name in HTML. May be this is currently Drafted in upcoming HTML version.
There does not appear to be such value possible.
I tried :
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta name="mode" content="full" />
</head>
<body>
</body>
</html>
into the W3C HTML5 validator and it throws it as an error.
See this for possible values for the <meta> tag.
Related
I´m researching about HTML5 and have maybe a stupid doubt:
Can I close the tags? Will this affect the functionality?
Examples:
HTML5
<!DOCTYPE html>
// Is the same <!DOCTYPE html /> ?
<html lang="en">
// Is the same <html lang="en" /> ?
<meta charset =" utf-8">
Is the same <meta charset =" utf-8" /> ?
I ask this because in ALL the books I read show tags without closing slash. I understand the "new manner", the lack of need, etc, etc, etc. I just want to know if the use of closed tags could be a problem or goes against the standard.
In HTML5 you can still close the tags as in XML. The change that was made in HTML5 was that it is now valid to not close single element tags such as <input>, <meta>, etc., but it's completely optional.
<!-- valid -->
<meta charset="utf-8"/>
<!-- also valid -->
<meta charset="utf-8">
I'm trying to use Dublin Core with HTML5, when I try to validate the code with W3C validator I got a error.
This is the code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<link rel="schema.dcterms" href="http://purl.org/dc/terms/">
<meta name="dc.language" content="en">
<meta name="dc.title" content="web site title" />
<title>Test</title>
</head>
<body>
</body>
</html>
The meta keyword dc.language is registered: valid.
The link type schema.dcterms is registered, however, not in the "HTML5 link type extensions" section (so it doesn’t confirm to the requirements described in the HTML5 spec): so it’s, strictly speaking, invalid.
The meta keyword dc.title is not registered: invalid.
You might want to use dcterms.title instead. (By the way, the keyword dcterms.language is also registered.)
I'm getting this error when I validate my HTML using the W3C validator:
Bad value language for attribute name on element meta: Keyword language is not registered.
<meta name="language" content="en" />
How can I solve this?
Use
<html lang="en">
Source
You should specify the language on the HTML tag, like so:
<html lang="en">
You can also ues the lang attribute on any element, so if you have just one div with French in it, you could do:
<html lang="en">
...
<body>
...
<div lang="fr"></div>
...
</body>
</html>
I think you're looking for content-language
<meta http-equiv="Content-Language" content="en" />
What is the correct way to use start tag when creating with HTML5
IE: HTML 4 Strict is like this
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
The standard has been simplified because the previous doctypes were too cryptic. The new doctype is simply <!DOCTYPE html> . You may wonder why it is not <!DOCTYPE html5> but it is simply because it is just an update to the standard of HTML and not a new version of anything. As you can see below, all elements can now have a language attribute.
The <html> element is the root element of a document. Every document
must begin with this element, and it must contain both the <head> and
<body> elements.
It is considered good practice to specify the primary language of the
document on this element using the lang attribute.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Hello World</title>
</head>
<body>
<h1>Hello World</h1>
<p>
Jamie was here.
</p>
</body>
</html>
More info: https://dev.w3.org/html5/html-author/#doctype-declaration
you just use
<!DOCTYPE html>
<html>
</html>
First of all, html5 doctype is not case sensitive.
Either one of these three will work:
1) <!DOCTYPE html>
2) <!DOCTYPE HTML>
3) <!doctype html>
You can check the validity here.
It's as simple as
<!DOCTYPE html>
According to the WWW Consortium, the organization responsible setting current web standards, no one has answered this correctly.
The current standard for language declaration is
Always use a language attribute on the html tag to declare the default
language of the text in the page. When the page contains content in another
language, add a language attribute to an element surrounding that content.
Use the lang attribute for pages served as HTML, and the xml:lang attribute
for pages served as XML. For XHTML 1.x and HTML5 polyglot documents, use both
together.
W3C HTML Language Tag Page
Here is the answer regarding DOCTYPE declaration
Use the following markup as a template to create a new HTML document using a
proper Doctype declaration. See the list below if you wish to use another DTD.
W3C DOCTYPE Standards
<!DOCTYPE html>
<html>
<head>
<title>An HTML standard template</title>
<meta charset="utf-8" />
</head>
<body>
<p>… Your HTML content here …</p>
</body>
</html>
Hope this helps.
You use...
<!DOCTYPE html>
followed by your HTML tag etc..
You only need this:
<!DOCTYPE html>
<html>
...
There are several points here. This is supported by all browsers, even old ones like IE6/IE7. All browsers actually nee "html" part from doctype declaration to jump into standards mode.
<!-- simplified doctype works for all previous versions of HTML as well -->
<!doctype html>
Learning Resource:
http://diveintohtml5.info/
http://www.html5doctor.com
The start tag <html> is optional in HTML5, as in HTML 4.01. If used, it must be the first tag. It has different optional attributes: the global attributes of HTML5, and the special manifest attribute. The most common useful attribute in the <html> tag is the lang attribute.
(The doctype declaration is something quite different, and not a tag at all.)
The clearest most definitive answer of what the standard says seems to be for HTML 5.3 at:
http://w3c.github.io/html/syntax.html#the-doctype
Note especially the list-items 1 and 3 which specify that the doctype-statement is case-insensitive. Also note the number of spaces inside the statement can vary.
And note the clause "A DOCTYPE is a required preamble."
I am using few facebook social plugins and I am using the meta header. When validating the page, the W3C validator is throwing the error -> "Error: there is no attribute "property".
I am using the XHTML Transitional doctype - <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
Pls Suggest if I have to change the doctype to something else.
Facebook's plugins use Open Graph, which is built on RDFa. It's RDFa that adds the property attribute to elements. Without this addition, plain HTML has no such attribute. (If you ask me, it's a strange design to add a new attribute without namespacing it, and to re-use half of a <meta> tag. But no-one did.)
To validate XHTML-with-RDFa, you'll need the DOCTYPE:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML+RDFa 1.0//EN" "http://www.w3.org/MarkUp/DTD/xhtml-rdfa-1.dtd">
This means you will have to be writing valid XHTML 1.1. More
In order for a document to claim that it is a conforming HTML+RDFa document, it must provide the facilities described as mandatory in this section. The document conformance criteria are listed below, of which only a subset are mandatory:
All document conformance requirements stated as mandatory in the HTML5 specification must be met.
There should be a version attribute on the html element. The value of the version attribute should be HTML+RDFa 1.0 if the document is a non-XML mode document, or XHTML+RDFa 1.0 if the document is a XML mode document.
There may be a link element contained in the head element that contains profile for the the rel attribute and http://www.w3.org/1999/xhtml/vocab for the href attribute.
Example:
<html version="HTML+RDFa 1.1" lang="en">
<head>
<title>Example Document</title>
</head>
<body>
<p>Moved to example.org.</p>
</body>
</html>
As Open Graph suggests, if you're using HTML5, you're better off just using a prefix attribute like this:
<!doctype html>
<html prefix="og: http://ogp.me/ns#">
<head>
<title>HTML5 site</title>
<meta property="og:title" content="The Rock" />
</head>
<body>
</body>
</html>
You can leave the doctype as is and it will validate.
This approach has also been recommended by an Open Graph developer.