Use lowercase doctype

[ngyikp]

Currently, the useShortDoctype option rewrites doctypes to uppercase

HTML5 Boilerplate uses lowercase doctype for several years already, there's not much complaints other than incompatibility with XHTML

h5bp/html5-boilerplate#1522

[alexlamsl]

Does the current behaviour cause failure in any major browsers?

[ngyikp]

No

It's just a compression suggestion to shave a few bytes when gzipped

[alexlamsl]

Unless there is comprehensive proof that nothing breaks and there is a general reduction in gzip sizes across a representative sample, I'm reluctant for any code changes.

[XhmikosR]

@alexlamsl: you should revisit this. Lowecase doctype does save a few bytes and doesn't cause any issues.

[alexlamsl]

@XhmikosR I shall take your word on compatibility 😉

Will put together a PR after my belated 🎂 party.

[XhmikosR]

Hey, it's no my word, it's the community's word ;) You can never beat such extended testing.

[alexlamsl]

Speaking of community...

https://stackoverflow.com/questions/7020961/uppercase-or-lowercase-doctype

Note that if you don’t uppercase DOCTYPE in an XHTML document, the XML parser will return a syntax error.

According to the discussions above, if we go for uppercase, everything works - otherwise something might break.

[XhmikosR]

But when the option to use the HTML5 doctype is enabled, then that case isn't valid, is it? Or maybe I'm missing something in regards to XHTML since I've never had the need to use such thing.

[DamonHD]

FWIW I can confirm that in my use case, for minified static (GZIPPed) HTML pages, using "doctype" lowercase does save bytes in the compressed/transferred result. If I wanted XHTML output then all sorts of other optimisations would have to go away too, such as dropping optional closing tags and element* quoting.

[Edit: * I meant attribute value, sorry!]

[alexlamsl]

@XhmikosR they mentioned something along the lines of XHTML5

@DamonHD thanks for the observation and the point about optional tags

I was worried about those enterprisy (read: Java) libraries getting upset about conformance issues, but you guys have successfully convinced me otherwise.

Will put that PR together when I get home.