In jade, I want to put in a html tag conditional as per this method, which puts in
<!--[if lt IE 7 ]> <html class="ie6"> <![endif]-->
<!--[if IE 7 ]> <html class="ie7"> <![endif]-->
<!--[if IE 8 ]> <html class="ie8"> <![endif]-->
<!--[if IE 9 ]> <html class="ie9"> <![endif]-->
<!--[if (gt IE 9)|!(IE)]><!--> <html class=""> <!--<![endif]-->
at the top of a html file.
I tried
//[if lt IE 7]> <html class="no-js ie6 oldie" lang="en"> <![endif]
//[if IE 7]> <html class="no-js ie7 oldie" lang="en"> <![endif]
//[if IE 8]> <html class="no-js ie8 oldie" lang="en"> <![endif]
//[if gt IE 8]><!--> <html class="no-js" lang="en"> <!--<![endif]
head
...
but jade ignores the html tag, and doesn't write in the end </html> tag. This is invalid html, and results in IE not displaying anything at all.
Is there any way of doing it?
I'm thinking I'll just use a javascript solution if there isn't a way.
This method works, with the closing html tag:
!!! 5
//if lt IE 7
<html class="no-js lt-ie9 lt-ie8 lt-ie7">
//if IE 7
<html class="no-js lt-ie9 lt-ie8">
//if IE 8
<html class="no-js lt-ie9">
// [if gt IE 8] <!
html(class="no-js", lang="en")
// <![endif]
head
title= title
body!= body
from: https://gist.github.com/kmiyashiro/1140425#comment-675550
Update:
As pointed out by kumar-harsh this behaviour has now been depreciated, if you need this functionality you now should use regular html:
<!--[if IE]>
<html class="ie">
<![endif]-->
<![if !IE]>
<html class="not-ie">
<![endif]>
</html>
from: https://github.com/visionmedia/jade/issues/1345?source=cc#issuecomment-31920732
This is what you're looking for, and it will also give the closing html tag.
!!! 5
//[if lt IE 7]><html lang="en" class="no-js oldie lt-ie9 lt-ie8 lt-ie7"><![endif]
//[if IE 7]><html lang="en" class="no-js oldie lt-ie9 lt-ie8"><![endif]
//[if IE 8]><html lang="en" class="no-js oldie lt-ie9"><![endif]
//[if gt IE 8]><!
html(class='no-js', lang='en')
//<![endif]
head
Simply use this syntax, mind the different indentation:
!!! 5
| <!--[if lt IE 7]> <html class="ie6 oldie" lang="en"> <![endif]-->
| <!--[if IE 7]> <html class="ie7 oldie" lang="en"> <![endif]-->
| <!--[if IE 8]> <html class="ie8 oldie" lang="en"> <![endif]-->
| <!--[if gt IE 8]><!--> <html lang="en"> <!--<![endif]-->
head
…
In version 1.0.0 (released on 22 December 2013) Jade does not parse comments content any more and support for the IE conditional comments has been removed (//if lt IE 7 will not work as in version 0.35.0 and below).
The new approach is to use well formatted IE conditional comments. So in order to generate above IE conditional comments, Jade template will have to be as follows:
<!--[if lt IE 7 ]> <html class="ie6"> <![endif]-->
<!--[if IE 7 ]> <html class="ie7"> <![endif]-->
<!--[if IE 8 ]> <html class="ie8"> <![endif]-->
<!--[if IE 9 ]> <html class="ie9"> <![endif]-->
<!--[if (gt IE 9)|!(IE)]><!-->
html(class="")
<!--<![endif]-->
...
Note that the first four html elements are well formatted HTML elements. The last one uses Jade syntax. Also the last comment <!--<![endif]--> has to be indented.
With Jade version 1.0.0 and above it is safe to use HTML comments as Jade will ignore any line beginning with < character.
You can also visit this post on IE Conditional Comments in Jade which talks about difference between Jade version 0.35.0 and 1.0.0. It also shows alternative approach of using Jade mixins mechanism for conditional comments.
Starting at version 1.0.0, the // if construct is not magical anymore. Either render HTML verbatim (any line starting with < is transmitted as-is by Jade) or use a mixin, as per Tom's blog cited in another answer:
mixin ie(condition)
| <!--[!{condition}]>
block
| <![endif]-->
doctype html
html
head
title= My title
+ie('if IE 8')
link(rel='stylesheet', href='/stylesheets/style-ie8-1.css')
Very simple.
Exemple:
HTML
<!--[if lt IE 7 ]><html class="ie ie6" lang="en"><![endif]-->
<!--[if IE 7 ]><html class="ie ie7" lang="en"><![endif]-->
<!--[if IE 8 ]><html class="ie ie8" lang="en"> <![endif]-->
JADE
//[if lt IE 7]>
<html class="ie ie6" lang="en"> <![endif]
//[if IE 7]>
<html class="ie ie7" lang="en"> <![endif]
//[if IE 8]>
<html class="ie ie8" lang="en"> <![endif]
as far as i know you can not put html tags like this in jade. for this either you need to include an html or by using trailing (.) in tags which supports text like:
p. <html><script></script>....
So html tag does not support text so you cant do it. the other solution is:
-if IE==6
html.ie6
-if IE==7
html.ie7
-if IE==8
html.ie8
-if IE==9
html.ie9
head
body
h1 My sit
来源：https://stackoverflow.com/questions/7757212/how-do-i-put-a-html-tag-conditional-in-jade