WD 090

Noopener

When using external links with target="_blank", the link should have a rel="noopener" attribute to prevent tab nabbing.

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Related Knowledge

Doctype
Charset
Viewport
X-UA-Compatible
Page Views
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 072

X-UA-Compatible

To instruct Internet Explorer to use its latest rendering engine.

RA 030

Page Views

Provide you the insight of how many and which of the page of content your visitors are consuming.

WD 075

Meta Description

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