在浏览器窗口(或电子邮件客户端预览窗格)中集中 HTML 电子邮件内容的最佳方法是什么？

CSS in emails is a pain. You'll probably need tables unfortunately, because CSS is not greatly supported in all email clients.

That said, use an HTML Transitional DOCTYPE, not XHTML, and use <center>.

Align the table to center.

<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center">
Your Content
</td>
</tr>
</table>

Where you have "your content" if it is a table, set it to the desired width and you will have centred content.

For googlers and completeness sake:

Here's a reference I always use when I need to go through the pain of implementing html email-templates or signatures: http://www.campaignmonitor.com/css/

I'ts a list of CSS support for most, if not all, CSS options, nicely compared between some of the most used email clients.

For centering, feel free to just use CSS (as the align attribute is deprecated in HTML 4.01).

<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="text-align: center;">
Your Content
</td>
</tr>
</table>

table align="center" ... this aligns the table center of page.

Using td align="center" centers the content inside that td, useful for centered aligned text but you will have issues with some email clients centering content in sub level tables so using using td align as a top level method of centering your "container" table on the page is not the way to do it. Use table align instead.

Still use your 100% wrapper table too, purely as a wrapper for the body, as some email clients don't display body background colors but it will show it with the 100% table, so add your body color to both body and the 100% table.

I could go on and on for ages about all the quirks of html email dev. All I can say is test test and test again. Litmus.com is a great tool for testing emails.

The more you do the more you will learn about what works in what email clients.

Hope this helps.

Here's your bulletproof solution:

<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="33%" align="center" valign="top" style="font-family:Arial, Helvetica, sans-serif; font-size:2px; color:#ffffff;">.</td>
<td width="35%" align="center" valign="top">
CONTENT GOES HERE
</td>
<td width="33%" align="center" valign="top" style="font-family:Arial, Helvetica, sans-serif; font-size:2px; color:#ffffff;">.</td>
</tr>
</table>

Just Try it out, Looks a bit messy, but It works Even with the new Firefox Update for Yahoo mail. (doesn't center the email because replace the main table by a div)

In some cases margin="0 auto" won't cut the mustard when center aligning a html email in Outlook 2007, 2010, 2013.

Try the following:

Wrap your content in another table with style="table-layout: fixed;" and align=“center”.

<!-- WRAPPING TABLE -->
<table cellpadding="0" cellspacing="0" border="0" style="table-layout: fixed;" align="center">
<tr>
<td>
<!-- YOUR TABLES AND EMAIL CONTENT GOES HERE -->
</td>
</tr>
</table>

I was struggling with Outlook and Office365. Surprisingly the thing that seemed to work was:

<table align='center' style='text-align:center'>
<tr>
<td align='center' style='text-align:center'>
<!-- AMAZING CONTENT! -->
</td>
</tr>
</table>

I only listed some of the key things that resolved my Microsoft email issues.

Might I add that building an email that looks nice on all emails is a pain. This website was super nice for testing: https://putsmail.com/

It allows you to list all the emails you'd like to send your test email to. You can paste your code right into the window, edit, send, and resend. It helped me a ton.

To center the table in the middle of the email use

<table width="100%" align="center" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
Your Content
</td>
</tr>
</table>

To align the content in the middle use:

<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center">
Your Content
</td>
</tr>
</table>