我使用HTML生成报告，在真实的纸张上正确地打印出真实大小。

如果你小心地使用mm作为CSS文件中的单位，你应该是OK的，至少对于单页。不过，人们可以通过改变浏览器中的打印缩放来搞砸你。

我似乎记得我所做的每一件事都是单页的，所以我不必担心分页——那可能要困难得多。

有很多方法:

使用毫米:

html, body {
    width:  210mm;
    height: 297mm;
}

使用公分cm:

html, body {
    width:  21.0cm;
    height: 29.7cm;
}

使用点pt:

html, body {
    width:  595pt;
    height: 842pt;
}

PPI and DPI make absolutely no difference to how a document will print off a browser. the printer takes no information on screen dot pitch or the DPI of the images etc. if you are printing images they would print at a size similar in proportion to how they are displayed on screen. the print processor of the browser would increase the DPI of the images from something rather low like 72dpi to whatever DPI the rest of the document is. say the image displays as half a page wide, then its about 4" wide physically. the pixel width of the image would be approx 300px to display correctly in the browser. by the time it prints at a nominal 300DPI, the processor has added pixels and the image will grow to around 1200px which at 300 DPI is 4".

当涉及到矢量或非基于像素的元素，如文本，打印机从驱动程序中选择自己的DPI，这与屏幕点间距或浏览器宽度无关。如果浏览器宽度为3000px，打印处理器将适当地换行文本。

heres what makes it hard about creating print displays: each browser and printer will interpret text sizes (pt, em, px) and spacing in its own way. depending on what printer, browser and maybe even OS you use, you will get a different amount of lines and characters per page. so even if you test on your computer using your browser and printer and figure out that you can display the text in a box at 640x900px and its perfect on print, the next guy who tries to print will possibly get it printing differently. there really is no way to force each printer and browser to get it identical each time.

忘记像素，更忘记DPI，你唯一可以使用像素的事情是设置一个表宽度，模拟打印机上可打印区域的宽度。在这种情况下，我发现640px宽是接近的。

完全可以将布局设置为a4页面的比例。你只需要设置相应的宽度和高度(可能检查窗口。innerHeight和window。虽然我不确定这是否可靠)。

The tricky part is with printing A4. Javascript for example only supports printing pages rudimentarily with the window.print method. As @Prutswonder suggested creating a PDF from the webpage probably is the most sophisticated way of doing this (other than supplying PDF documentation in the first place). However, this is not as trivial as one might think. Here's a link that has a description of an all open source Java class to create PDFs from HTML: http://www.javaworld.com/javaworld/jw-04-2006/jw-0410-html.html .

显然，一旦你创建了一个A4比例的PDF打印，它将导致一个干净的A4打印页面。这是否值得投入时间是另一个问题。

为每一页创建节，并使用下面的代码来调整页边距、高度和宽度。

如果你打印的是A4尺寸。

然后用户

Size : 8.27in and 11.69 inches

@page Section1 {
    size: 8.27in 11.69in; 
    margin: .5in .5in .5in .5in; 
    mso-header-margin: .5in; 
    mso-footer-margin: .5in; 
    mso-paper-source: 0;
}

div.Section1 {
    page: Section1;
} 

然后创建一个包含所有内容的div。

<div class="Section1"> 
    type your content here... 
</div>

or

@media print {
    .page-break { 
        height: 0; 
        page-break-before: always; 
        margin: 0; 
        border-top: none; 
    }
}

body, p, a,
span, td { 
    font-size: 9pt;
    font-family: Arial, Helvetica, sans-serif;
}

body {
    margin-left: 2em; 
    margin-right: 2em;
}

.page {
    height: 947px;
    padding-top: 5px;
    page-break-after: always;   
    font-family: Arial, Helvetica, sans-serif;
    position: relative;
    border-bottom: 1px solid #000;
}

我从1998年开始在商业报告中使用680px打印A4页。700px不能正确地拟合取决于边缘的大小。现代浏览器可以缩小页面以适应打印机上的页面，但如果您使用680像素，几乎在任何浏览器中都可以正确打印。

运行代码片段并查看结果:

window.print (); <table width=680 border=1 cellpadding=20 cellspacing=0> < tr > < th > # < / th > < th >名称< / th > < / tr > < tr对齐=中心> < td > 1 < / td > < td >唐纳德·特朗普< / td > < / tr > 2 < tr对齐=中心> < td > < / td > < td >巴拉克•奥巴马(BARACK OBAMA) < / td > < / tr > 表> < /

JSFiddle:

https://jsfiddle.net/ajofmm7r/