Detailed explanation of HTML document types Recommended_HTML/Xhtml_Web page production

Mine is:

Blog Park:

About HTML document type reference: http://i.wanz.im/2010/05/28/why_doctype_html/

I checked and found that there is a difference between the visual size of the current page obtained by JS and the scroll position of the page!
The page contains a 2000*2000 DIV. The data compiled by IE and Chrome on different HTML document types are as follows:
Standard:
Special:

When the HTML document type is not added to HTML, it defaults to special mode!

	Chrome标准	Chrome特殊	IE标准	IE特殊
document.body.clientTop;	0	0	0	2
document.body.clientLeft;	0	0	0	2
document.body.clientWidth;	473	473	471	471
document.body.clientHeight;	2000	625	2000	604
document.body.scrollTop;	224	289	0	255
document.body.scrollLeft;	315	388	0	278
document.body.scrollWidth;	2005	2005	2005	2010
document.body.scrollHeight;	2010	2010	2000	2005
document.body.offsetTop;	0	0	0	0
document.body.offsetLeft;	0	0	0	0
document.body.offsetWidth;	473	473	471	492
document.body.offsetHeight;	2000	2000	2000	625
document.documentElement.clientTop;	0	0	0	0
document.documentElement.clientLeft;	0	0	0	0
document.documentElement.clientWidth;	473	473	471	0
document.documentElement.clientHeight;	625	2010	604	0
document.documentElement.scrollTop;	0	0	199	0
document.documentElement.scrollLeft;	0	0	241	0
document.documentElement.scrollWidth;	2005	2005	2005	492
document.documentElement.scrollHeight;	2010	2010	2010	625
document.documentElement.offsetTop;	0	0	0	0
document.documentElement.offsetLeft;	0	0	0	0
document.documentElement.offsetWidth;	473	473	492	492
document.documentElement.offsetHeight;	2010	2010	625	625

Analysis:

Total page width: document.body.scrollWidth;
Total page height: document.body.scrollHeight;
Chrome page position: document.body.scrollTop; document.body.scrollLeft;
Chrome standard Page visible area: document.documentElement.clientWidth; document.documentElement.clientHeight;
Chrome special page visible area: document.body.clientWidth; document.body.clientHeight;
IE standard page position: document.documentElement .scrollTop; document.documentElement.scrollLeft;
IE standard page visible area: document.documentElement.clientWidth; document.documentElement.clientHeight;
IE special page position: document.body.scrollTop; document.body.scrollLeft ;
Visible area of ​​IE special page: document.body.clientWidth; document.body.clientHeight;
The JS code is as follows:

Copy code

The code is as follows:

function getSize() {
var obj = new Object();
obj.allWidth = document.body.scrollWidth;
obj.allHeight = document.body.scrollHeight;
if (-[1, ]) { //Non-IE
obj.top = document.body.scrollTop;
obj.left = document.body.scrollLeft;
if (document.compatMode === 'CSS1Compat') {
obj.width = document.documentElement.clientWidth;
obj.height = document.documentElement .clientHeight;
}
else {
obj.width = document.body.clientWidth;
obj.height = document.body.clientHeight;
}
} else {
if (document.compatMode === 'CSS1Compat') {
obj.width = document.documentElement.clientWidth;
obj.height = document.documentElement.clientHeight;
obj.top = document.documentElement .scrollTop;
obj.left = document.documentElement.scrollLeft;
}
else {
obj.width = document.body.clientWidth;
obj.height = document.body.clientHeight ;
obj.top = document.body.scrollTop;
obj.left = document.body.scrollLeft;
}
}
alert(obj.top);
alert( obj.left);
alert(obj.width);
alert(obj.height);
return obj;
}

Note: Discovery Blog Park Home Page The HTML document type is:

Why is it different from the essay display page?

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