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Among those email clients that do support HTML, some do not render it consistently with [[W3C]] specifications, and many HTML emails are not compliant either, which may cause rendering or delivery problems, especially for users of [[Gmail]].{{cn|date=March 2015}}
In particular, the <code><nowiki><head></nowiki></code> tag, which is used to house CSS style rules for an entire HTML document, is not well supported, sometimes stripped entirely, causing in-line style declarations to be the [[De facto standard|''de facto'' standard]], even though in-line style declarations are inefficient and fail to take good advantage of HTML's ability to separate style from content.{{cn|date=January 2015}} Although workarounds have been developed,<ref>{{cite web|author=Dialect <http://dialect.ca/> |url=http://premailer.dialect.ca/ |title=Premailer: make CSS inline for HTML e-mail |publisher=Premailer.dialect.ca |date= |accessdate=2012-06-24}}</ref> this has caused no shortage of frustration among newsletter developers, spawning the [[grassroots]] [http://www.email-standards.org/ Email Standards Project], which grades email clients on their rendering of an acid test, inspired by those of the [[Web Standards Project]], and lobbies developers to improve their products.<ref>{{cite web|url=https://www.campaignmonitor.com/blog/post/2468/why-we-need-web-standards-supp-1 |title=Why we need standards support in HTML email |publisher=Campaign Monitor |date= |accessdate=2012-06-24}}</ref> To persuade [[Google]] to improve rendering in [[Gmail]], for instance, they published a video montage of grimacing web developers,<ref>{{cite web |url=http://www.email-standards.org/gmail-appeal |title=The 2008 Gmail Appeal | Email Standards Project |publisher=Email-standards.org |date= |accessdate=2012-06-24 |deadurl=yes |archiveurl=https://web.archive.org/web/20120515030536/http://www.email-standards.org/gmail-appeal |archivedate=15 May 2012 |df=dmy-all }}</ref> resulting in attention from an employee.
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== Style ==
Some senders may excessively rely upon large, colorful, or distracting [[font]]s, making messages more difficult to read.<ref>{{cite web |last=Shobe |first=Matt |url=http://www.burningdoor.com/matt/archives/000782.html |title=A pretty fair argument against HTML Email |publisher=Burningdoor.com |date=2004-10-12 |accessdate=2012-06-24 |deadurl=yes |archiveurl=https://web.archive.org/web/20120424084806/http://www.burningdoor.com/matt/archives/000782.html |archivedate=24 April 2012 |df=dmy-all }}</ref> For those especially bothered by this formatting, some [[user agent]]s make it possible for the reader to partially override the formatting (for instance, [[Mozilla Thunderbird]] allows specifying a minimum font size); however, these capabilities are not globally available. Further, the difference in optical appearance between the sender and the reader can help to differentiate the author of each section, improving readability.
== Multi-part formats ==
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