consider lowercase X-UA-Compatible

[BLooperZ]

According to http://msdn.microsoft.com/en-us/library/jj676915.aspx:

The X-UA-Compatible header isn't case sensitive;

please consider making the meta tag from:
<meta http-equiv="X-UA-Compatible" content="IE=edge">
to:
<meta http-equiv="x-ua-compatible" content="IE=edge">
same reasons like Issue #1522

[arthurvr]

please consider making the meta tag from:
<meta http-equiv="X-UA-Compatible" content="IE=edge">
to:
<meta http-equiv="x-ua-compatible" content="IE=edge">

Is there any reason you'd still keep the IE capitalised?

At first this looks good to me, but I'd like to do some manual testing first. Nobody wants it's page rendering as it was IE6 😄

[BLooperZ]

In this source they have examples of using the meta tag,
you can notice that they do use it in lowercase though the "IE" stays capitilised,
so I don't know whether the "IE" statement is case-insensitive as well, need testing.

[battaglr]

If http-equiv and content are both case insensitive I would give this a big 👍.

Update: if I'm not wrong gzip normally works better when using lowercase... @alrra usually knows better about this kind of stuff. :)

[ghost]

I have tested this in IE 11 and yes this : <meta http-equiv="x-ua-compatible" content="ie=edge"> does work 👍 . I am happy to implement this if everyone is happy for this change to go ahead.

[arthurvr]

I have tested this in IE 11 and yes this : <meta http-equiv="x-ua-compatible" content="ie=edge">

Tested in IE11? Starting with IE11, document modes are deprecated :). Please refer to https://msdn.microsoft.com/en-us/library/ie/bg182625(v=vs.85).aspx#docmode. More importantly this needs to be tested on older browsers.

[ghost]

Oops completely forgot about that! Although I have reason to believe it will work as to check it was not just defaulting out at edge I also tried <meta http-equiv="x-ua-compatible" content="ie=8"> which resulted in rendering with document mode 8. However just to be on the safe side I will try with older versions of IE after school tommorow.

[ghost]

Ok so I have tested this in IE 10 and it works with all lower case. I may be a will before I can test in IE9 and 8 as the vm's that Microsoft provide won't import into virtual box at the moment :(

[kevinSuttle]

https://remote.modern.ie/

[arthurvr]

I was able to do little testing myself and everything works 🎉. You want to PR this, @BLooperZ?

[BLooperZ]

did you check it with lowercase "ie" as well?

[alrra]

Browser (OS)	Screenshot
IE 8 (Windows XP)
IE 9 (Windows XP)
IE 10 (Windows 7)

Everything seems to work.

I'm not wrong gzip normally works better when using lowercase

@battaglr If you have more text in lowercase, then usually yes.

same reasons like Issue #1522

Haha

If anyone is interested in some stats:

(:warning: Please keep in mind that those numbers are not necessarily representative for actual pages with content, so treated them just as fun stats!)

• Using <meta http-equiv="X-UA-Compatible" content="IE=edge">

  original size:         1820 B
  gzipped size:           885 B
  ─────────────────────────────
  reduction:              935 B [51.4%]
  

  Compression efficiency heat map:

  

  

• Using <meta http-equiv="x-ua-compatible" content="ie=edge">

  original size:         1820 B
  gzipped size:           888 B
  ─────────────────────────────
  reduction:              932 B [51.2%]
  

  Compression efficiency heat map:

  

  

[battaglr]

@alrra: great! off-topic: which tool do you use to generate those heat maps?

[patrickkettner]

its gzthermal

[alrra]

off-topic: which tool do you use to generate those heat maps?

@battaglr Like @patrickkettner said, I've used gzthermal.

[battaglr]

Thank you both!