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Should i use <!DOCTYPE html> on every file?

原文 2017-02-07 02:31:10 9 1 php/ html

I understand that i should allways use at the begining of my project webpage.

Is this true ONLY for the main page (index) or every html and php file must have it also?

1 answers

You should use it on every html page just like mrlew said. This tells the browser what version on html you are using. Some strict browser can misplace some stuff and disable some other features if this line is not recongnisez.

So let say you only put this on your index file, if the user go to another page /streamvideo and you didn't put this line, the html5 video player might just not work.

This being said, most common browser will 'fix' stuff like this or 'assume' you're using html5.

see http://www.html-5-tutorial.com/doctype.htm https://www.w3.org/QA/2002/04/valid-dtd-list.html (sorry i skipped the w3school link :P)

Opening these link made me think of another example i can give you. before html5, if you have frames in your web page, it would be accurate to use the frame set decralation.

Nice example in the w3org link above. hope this clear things out.

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Related Question What DocType should I use for my webapp? Do I need a !DOCTYPE declaration in a php file with html? Is Adding the Doctype at the top of the header file enough or does it need to be on top of every html file? Do I need doctype and other HTML tag in the PHP file that used for AJAX? Can i use PHP file to contain HTML data. Or should i seperated them? Should I use DomDocument for parsing html code Should I use $_GET to dynamically load html? Should I use AJAX or get every data beforehand PHP 5.3 Namespaces should i use every PHP function with backslash? Should I use “laravelcollective/html”: “5.2.” instead of “illuminate/html” in my composer.json file going forward with Laravel 5.2

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Should i use <!DOCTYPE html> on every file?

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1 answers

solution1 0 ACCPTED 2017-02-07 02:50:43

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0 ACCPTED 2017-02-07 02:50:43