Yahoo! Developer Network has a very interesting recommendation.
Yahoo! UI Library: Grids CSS states,
You must be rendering in Standards Mode to use Grids. Many doctypes will trigger Standards Mode in the browser, but we recommend and use this one.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<!-- layouts require "Standards Mode" rendering,
which the 401-strict doctype triggers -->
The Yahoo! index page follows its Developer Network Guidelines (except for lacking an external style sheet.)
However.
- Yahoo!
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- Yahoo! Audio
-
<!doctype html public "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="content-type" content="text/html; charset=UTF-8">
- Yahoo! Autos
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta charset="ISO-8859-1" /> -
[Note: All meta:elements were self-closed.]
- Yahoo! Directory
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="content-type"; content="text/html; charset=UTF-8">
- Yahoo! Finance
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- Yahoo! Finance
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- Yahoo! Games
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- Yahoo! GeoCities
-
No DocType declared/No Content-Type declared/No Content-Encoding declared
- Yahoo! Groups
-
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> -
No Content-Type declared/No Content-Encoding declared
- Yahoo! Hot Jobs
-
No DocType declared
-
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- Yahoo! Images
-
<!doctype html public "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="content-type" content="text/html; charset=UTF-8">
- Yahoo! Local
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- Yahoo! Maps
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> -
No Content-Type declared/No Content-Encoding declared
- Yahoo! Movies
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> -
No Content-Type declared/No Content-Encoding declared
- Yahoo! Music
-
No DocType declared/No Content-Type declared/No Content-Encoding declared
- Yahoo! News
-
<!doctype html public ";-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="content-type" content="text/html; charset=UTF-8">
- Yahoo! Personals
-
No DocType declared
-
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
- Yahoo! Photos
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
- Yahoo! Real Estate
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> -
No Content-Type declared/No Content-Encoding declared
- Yahoo! Search Blog
-
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
- Yahoo! Shopping
-
No DocType declared
-
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
- Yahoo! Sports
-
No DocType declared/No Content-Type declared/No Content-Encoding declared
- Yahoo! Tech
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="content-type" content="text/html; charset=UTF-8">
- Yahoo! Travel
-
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1; lang=en-US">
- Yahoo! TV
-
No DocType declared/No Content-Type declared/No Content-Encoding declared
- Yahoo! Video
-
<!doctype html public "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> <meta http-equiv="content-type" content="text/html; charset=UTF-8">
- Yahoo! Yellow Pages
-
No DocType declared/No Content-Type declared/No Content-Encoding declared
All HTTP Response Headers returned,
- Content-Type:text/html
- Content-Encoding:gzip
Yahoo! Developer Network recommends HTML 4.01/Strict for rendering standards mode in user agents. Therefore, if one follows the World Wide Consortium’s implied use of the word “recommendation”, e.g., “directive”, HTML 4.01/Strict’s it.
And, for them what cares,
- No DocType declared
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
[Published date: 9 September 2006]