Trident（又称为MSHTML、IE内核），是微软的窗口操作系统（Windows）搭载的网页浏览器—Internet Explorer的排版引擎的名称，它的第一个版本随着1997年10月Internet Explorer第四版发布，之后不断的加入新的技术并随着新版本的Internet Explorer发布。在Internet Explorer第七版中，微软对Trident排版引擎做了的重大的变动，除了加入新的技术之外，并增加对网页标准的支持。尽管这些变动已经在相当大的程度上落后了其它的排版引擎，如Gecko、KHTML、Webkit及Presto。

Trident (also known as MSHTML) is a proprietary layout engine for the Microsoft Windows version of Internet Explorer, developed by Microsoft.

It was first introduced with the release of Internet Explorer version 4.0 in October 1997; it has been steadily upgraded and remains in use today. For versions 7 and 8 of Internet Explorer, Microsoft made significant changes to the Trident layout engine to improve compliance with web standards and add support for new technologies. Since then, Microsoft intends to comply with many modern web standards , and also intends to significantly update the layout engine to be more competitive and modern compared to other current layout engines.