WD 077

Canonical

Use rel="canonical" to avoid duplicate content.

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Related Knowledge

Doctype
Charset
Viewport
Language Tag
Page Title
Meta Description

Related Knowledge

WD 070

Doctype

Doctype informs the validator which version of (X)HTML you're using, and must appear at the very top of every web page.

WD 071

Charset

A web browser must know which character set to use to display an HTML page correctly.

WD 073

Viewport

Declare viewport for responsive web design.

WD 078

Language Tag

Declare the language of a web page to assist search engines and browsers.

WD 074

Page Title

The title should not longer than 65 characters for SEO purpose.

WD 075

Meta Description

A meta description is unique and doesn't possess more than 150 characters.