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Does Firefox support HTML5 and CSS3?

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Are all HTML5 and CSS3 specifications implemented by FIrefox? If not what level of support for these specification is implemented? Also if not, is support planned for the near future?

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That's a big question. For individual tags, attributes, or properties of interest, you can check the Mozilla Developer Network site:

You may find useful third party sites showing comparisons of support for various features of HTML5 and CSS3, but it is a challenge keeping them up-to-date due to rapid change in the industry.

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In IE9 there is a drop down list box that lets you select html5/css3 and other document types. Is there something similar in FF

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Soluzione scelta

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Hi pamam, you asked:

In IE9 there is a drop down list box that lets you select html5/css3 and other document types. Is there something similar in FF

I don't think those features can be turned off. Firefox doesn't have specific past version backwards compatibility modes similar to IE's.

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Thanks for the response. I thought all of them had that setting. Does FireFox figure out what kind of file it is from the doctype? thanks,


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The basic DOCTYPE for HTML5 is <!DOCTYPE html>

See also: bug 568516 - (html5) Finish HTML5

(please do not comment in bug reports: https://bugzilla.mozilla.org/page.cgi?id=etiquette.html)

Modificato da cor-el il

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Sorry, I thought this was a forum and I did not add the line "See also: bug 568516 - (html5) Finish HTML5"

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Hi pamam, it's a hybrid: a support ticket system with forum-like features. Notifications are sent for the original post, but if the poster edits her or his comments, that is not emailed out. Actually most forums are like that, so it's always a good idea to go online and view the post rather than relying on an email notification.

My understanding is that Firefox has one standards mode. Whether the doctype is HTML 4, HTML 5, or XHTML, the page is rendered in standards mode (i.e., latest iteration).

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I have this problem, too. I checked the page on HTML5 that jscher2000 recommended above. I understood it to say that nav, aside, article, etc. tags should work just like div tags.

Unfortunately, although Dreamweaver shows a page as I hoped it would be rendered, a test in the Firefox browser does not!

I looked at the mdn article on HTML5 source code and saw that these tags were combined with div tags and I am unsure which tag is controlled by the CSS rules. My initial impression is that both do. However, the examples on the HTML5 page https://developer.mozilla.org/en-US/docs/HTML/HTML5 do not use the div tags.

Is there a specific trick to making the tags work? I did not use a section tag to contain these. Was that my mistake?

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As you seek for your HTML5 solutions, be careful not to get scammed.

HTML5 is of great interest to many information technology professionals. Unfortunately this interest is being abused by some individuals such as Martti Malmi. In 2012 after helping develop the Bitcoin eCurrency, Martti Malmi joined Pyry Lehdonvirta’s company SC5, to help them develop HTML5. In a recent Ripoff Report by an HTML5 GAME SITE developer based in Nebraska, Martti Malmi is alleged to have swindled the user of over 20000 Euros and the company he worked under apparently did nothing about it.

Anyone out there who has been scammed by an HTML5 developer should share their experiences to help other tech professionals stay safe.

Source: http://hpub.org/martti-malmi-named-in-sc5-html5-scam-by-shannon-schutz/