Can I use HTTP-equiv?

The http-equiv attribute provides an HTTP header for the information/value of the content attribute. The http-equiv attribute can be used to simulate an HTTP response header.

What is the use of viewport meta tag?

To mitigate this problem of virtual viewport on narrow screen devices, Apple introduced the “viewport meta tag” in Safari iOS to let web developers control the viewport’s size and scale. Many other mobile browsers now support this tag, although it is not part of any web standard.

What are the important meta tags?

By using these meta tags, you can boost your website’s SEO.

Title Tag. The title tag is the first HTML element that specifies what your web page is about.
Meta Description.
Canonical Tag.
Alternative Text Tag.
Robots Meta Tag.
Open Graph Meta Tags and Twitter Cards.
Header Tags.
Responsive Design Meta Tag.

What is the X-UA Compatible value in IE?

How does the X-UA-Compatible value determine the document mode?

The X-UA-Compatible value determines Windows Internet Explorer’s document as follows: For example, in Windows Internet Explorer 8, IE=9, IE=Edge, and IE=EmulateIE9 result in IE8 mode. Browser emulation modes are not document modes. They instruct Internet Explorer about how to select a document mode when a valid declaration is included.

What does the X-UA-compatible meta tag mean?

The X-UA-Compatible meta tag allows web authors to choose what version of Internet Explorer the page should be rendered as. IE11 has made changes to these modes; see the IE11 note below. Microsoft Edge, the browser that will be released after IE11, will only honor the X-UA-Compatible meta tag in certain circumstances.

Which is the best way to use X-UA?

The best practice is an X-UA-Compatible HTTP Header. Adding the directive to the response header tells Internet Explorer what engine to use before parsing content begins. This must be configured in the web site’s server. In other words, there’s better ways of implementing X-UA-Compatible if you absolutely need it.