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{{noteTA
|G1=IT
}}
{{Infobox Software
| name = Windows Internet Explorer 9
| logo =
| screenshot = Internet Explorer 9 zh-hk.png
| caption = Internet Explorer 9執行於[[Windows 7]]
| developer = [[微軟]]
| released = {{Start date and age|2011|03|14}}
| latest release version = 9.0.46（v9.0.8112.16421）
| latest release date =
| operating system = [[Windows 7]]<br />[[Windows Vista]] [[Windows Vista#Service Pack 2|SP2]]<br />[[Windows Server 2008]] SP2<br />[[Windows Server 2008 R2]]<br />[[Windows Phone 7|Windows Phone 7.5]]
| engine = [[Trident (排版引擎)|Trident 5.0]]、[[Chakra (JScript引擎)|Chakra]]
| genre = [[網頁瀏覽器]]
| license = [[專有軟體|私有]]
}}
'''{{lang|en|Windows Internet Explorer 9}}'''（簡稱'''{{lang|en|IE9}}'''）是[[微軟]]開發的瀏覽器[[Internet Explorer]]的稳定版本，[[軟件版本週期#Release To Manufacturing|RTM]]版本已於2011年3月14日向公众發佈<ref name="IE9 launching March 14">{{cite web|url = http://windowsteamblog.com/ie/b/ie/archive/2011/03/09/a-more-beautiful-web-launches-on-march-14th.aspx|title = A More Beautiful Web Launches on March 14th|publisher = The Windows Blog|accessdate = 2011-03-16|archive-date = 2011-03-10|archive-url = https://web.archive.org/web/20110310125301/http://windowsteamblog.com/ie/b/ie/archive/2011/03/09/a-more-beautiful-web-launches-on-march-14th.aspx|dead-url = no}}</ref>。

IE9支持部分[[CSS|CSS3]]屬性<ref name="preview-6"/>，透過Windows Color System支援內嵌[[國際色彩聯盟|ICC]] v2或v4[[ICC色彩特性文件|色彩配置]]，並且提升了[[JavaScript]]的性能。IE9還將利用[[Direct2D]]、DirectWrite和[[Media Foundation]]實現[[硬件加速]]的圖像、包含Windows Imaging Component提供的映像功能以及由[[XML紙張規範|XPS]]列印管道提供的低失真列印功能<ref>{{cite web
|url = http://blogs.msdn.com/ie/archive/2010/04/09/Benefits-of-GPU-powered-HTML5.aspx
|title = Benefits of GPU-powered HTML5
|work = IEBlog
|publisher = Microsoft corporation
|date = 2010-04-09
|accessdate = 2011-02-26
|archive-date = 2010-04-13
|archive-url = https://web.archive.org/web/20100413012400/http://blogs.msdn.com/ie/archive/2010/04/09/Benefits-of-GPU-powered-HTML5.aspx
|dead-url = no
}}</ref>。IE9還支援[[HTML5]] <code>video</code>和<code>audio</code>標籤以及[[開放字型格式|WOFF]]<ref>{{cite web
|url=http://blogs.msdn.com/ie/archive/2010/04/23/meet-woff-the-standard-web-font-format.aspx
|title=Meet WOFF, The Standard Web Font Format
|work=IEBlog
|publisher=Microsoft Corporation
|date=2010-04-23
|first=Sylvain
|last=Galineau
|accessdate=2016-08-13
|archive-date=2010-04-26
|archive-url=https://web.archive.org/web/20100426115200/http://blogs.msdn.com/ie/archive/2010/04/23/meet-woff-the-standard-web-font-format.aspx
|dead-url=no
}}</ref>。

除此之外，IE9新增新索引標籤顯示使用者常用網站的圖示、釘選網站到工作列、附加元件效能警告、內置下載管理員等功能。微軟只單獨發布Internet Explorer 9，從未（亦不打算）於任何官方版本的Windows系統內預載<ref>鑑於Windows 8 Release Preview中已包括了[[IE10]]的開發版本，所以外界普遍認為[[IE9]]將不會預設安裝於[[Windows 8]]中。</ref>。

IE9只支援[[Windows Vista#Service Pack 2|Windows Vista SP2]]及[[Windows 7]]，對於在[[亞太地區]]尚極為普及的[[Windows XP]]<ref>{{cite web |url = http://gs.statcounter.com/#os-as-monthly-201106-201207 |title = Top 7 Desktop, Tablet & Console OSs in Asia from June 2011 to July 2012 |publisher = StatCounter Global Stats |accessdate = 2012-07-06 |archive-date = 2012-05-26 |archive-url = https://archive.today/20120526/http://gs.statcounter.com/%23mobile_browser-ww-monthly-201012-201111-bar#os-as-monthly-201106-201207 |dead-url = no }}</ref>卻抱放棄態度，不對任何版本的Windows XP進行支援，Windows XP用戶只能更新至[[IE 8]]。另外，IE9是最後一個支援Windows Vista的版本<ref name="PCMag1">{{cite news
| url=http://www.pcmag.com/article2/0,2817,2383640,00.asp
| title=Internet Explorer 10 drops Vista support
| work=PC Magazine
| publisher=Ziff Davis, Inc
| date=2011-04-15
| accessdate=2011-04-21
| last=Muchmore
| first=Michael
| archive-date=2018-06-18
| archive-url=https://web.archive.org/web/20180618102656/https://www.pcmag.com/article2/0,2817,2383640,00.asp
| dead-url=no
}}</ref><ref name="Computerworld1">{{cite web
| url=http://www.computerworld.com/s/article/9215791/Windows_Vista_No_IE10_for_you
| title=Windows Vista: No IE10 for you
| work=Computerworld
| publisher=Computerworld Inc
| date=2011-04-13
| accessdate=2011-04-21
| last=Keizer
| first=Gregg
| archive-date=2012-10-26
| archive-url=https://www.webcitation.org/6BhvgF4Rv?url=http://www.computerworld.com/s/article/9215791/Windows_Vista_No_IE10_for_you
| dead-url=no
}}</ref><ref name="download-worldwide">{{cite web
|url=http://windows.microsoft.com/en-US/internet-explorer/downloads/ie-9/worldwide-languages
|title=Download languages for Internet Explorer 9
|work=microsoft.com
|publisher=Microsoft Corporation
|accessdate=2011-02-26
|archive-date=2013-07-31
|archive-url=https://web.archive.org/web/20130731072722/http://windows.microsoft.com/en-us/internet-explorer/downloads/ie-9/worldwide-languages
|dead-url=no
}}</ref><ref>{{cite web
|url=http://dvice.com/archives/2010/03/internet-explor.php
|title=Internet Explorer 9 adds HTML5, drops Windows XP
|work=Dvice.com
|publisher=NBC Universal
|first=Kevin
|last=Hall
|date=2010-03-17
|accessdate=2016-08-14
|archive-date=2012-08-20
|archive-url=https://web.archive.org/web/20120820075603/http://dvice.com/archives/2010/03/internet-explor.php
|dead-url=no
}}</ref><ref>{{cite web
|url = http://blogs.zdnet.com/microsoft/?p=5572&tag=col1;post-5572
|title = Microsoft IE9 developer preview with HTML5 support ready for download
|work = ZDNet
|publisher = CBS Interactive
|first = Mary Jo
|last = Foley
|date = 2010-03-16
|accessdate = 2011-02-26
|archive-date = 2010-04-21
|archive-url = https://web.archive.org/web/20100421213519/http://blogs.zdnet.com/microsoft/?p=5572&tag=col1;post-5572
|dead-url = yes
}}</ref><ref name="download-ie-10">{{cite web
|url=http://windows.microsoft.com/en-us/internet-explorer/downloads/ie-10/worldwide-languages
|title=Download Internet Explorer 10
|work=microsoft.com
|publisher=Microsoft Corporation
|accessdate=2013-03-18
|archive-date=2013-04-30
|archive-url=https://web.archive.org/web/20130430134240/http://windows.microsoft.com/en-us/internet-explorer/downloads/ie-10/worldwide-languages
|dead-url=no
}}</ref><ref name="IE10Ars">{{cite web |url=http://arstechnica.com/information-technology/2011/04/microsofts-raw-deal-for-vista-users-ie10-for-windows-7-only/ |title=Microsoft's raw deal for Vista users: IE10 for Windows 7 only |last=Bright |first=Peter |date=2011-04-15 |publisher=Condé Nast |work=ArsTechnica |accessdate=2015-06-11 |archive-date=2015-06-15 |archive-url=https://web.archive.org/web/20150615100622/http://arstechnica.com/information-technology/2011/04/microsofts-raw-deal-for-vista-users-ie10-for-windows-7-only/ |dead-url=no }}</ref>，IE10-{只}-能運行於Windows 7或更新版本。
== 版本發布 ==
{| class="wikitable" style="text-align:left; font-size:90%"
|+
|-
! 名稱
! 版本
! 發布日期
! [[Acid3]]的分數
! 新特點
|-
| style="white-space:nowrap; background:LightPink; width:250px"| Internet Explorer 9 Platform Preview 1
| 1.9.7745.6019
| style="width:130px"|2010年3月16日<ref>{{citation |url=http://blogs.msdn.com/ie/archive/2010/03/16/html5-hardware-accelerated-first-ie9-platform-preview-available-for-developers.aspx |title=HTML5, Hardware Accelerated: First IE9 Platform Preview Available for Developers |publisher=Microsoft |first=Dean |last=Hachamovitch |date=2010-03-16 |accessdate=2010-08-23 |archive-date=2010-03-22 |archive-url=https://web.archive.org/web/20100322204435/http://blogs.msdn.com/ie/archive/2010/03/16/html5-hardware-accelerated-first-ie9-platform-preview-available-for-developers.aspx |dead-url=no }}</ref>
| style="width:80px" | 55／100<ref>{{citation |url=http://ie.microsoft.com/testdrive/benchmarks/Acid3-pp1/Default.html |title=The Web Standards Project's Acid3 Test — Platform Preview 1 |publisher=Microsoft |deadurl=yes |archiveurl=https://web.archive.org/web/20100806191050/http://ie.microsoft.com/testdrive/benchmarks/Acid3-pp1/Default.html |archivedate=2010-08-06 |accessdate=2010-08-23 }}</ref>
| style="width:430px" | 支援[[CSS3]]和[[SVG]]、新的[[JavaScript]]引擎[[Chakra (JScript引擎)|Chakra]]。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 2
| 1.9.7766.6000
| 2010年5月5日<ref>{{citation |url=http://blogs.msdn.com/ie/archive/2010/05/05/html5-and-same-markup-second-ie9-platform-preview-available-for-developers.aspx |title=HTML5 and Same Markup: Second IE9 Platform Preview Available for Developers |publisher=Microsoft |first=Dean |last=Hachamovitch |date=2010-05-05 |accessdate=2010-08-23 |archive-date=2010-05-07 |archive-url=https://web.archive.org/web/20100507010331/http://blogs.msdn.com/ie/archive/2010/05/05/html5-and-same-markup-second-ie9-platform-preview-available-for-developers.aspx |dead-url=no }}</ref>
| 68／100<ref>{{citation |url=http://ie.microsoft.com/testdrive/benchmarks/Acid3-pp2/Default.html |title=The Web Standards Project's Acid3 Test — Platform Preview 2 |publisher=Microsoft |deadurl=yes |archiveurl=https://web.archive.org/web/20100806081451/http://ie.microsoft.com/testdrive/benchmarks/Acid3-pp2/Default.html |archivedate=2010-08-06 |accessdate=2010-08-23 }}</ref>
| 改善JavaScript性能。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 3
| 1.9.7874.6000
| 2010年6月23日<ref>{{citation |url=http://blogs.msdn.com/b/ie/archive/2010/06/23/html5-native-third-ie9-platform-preview-available-for-developers.aspx |title=HTML5, Native: Third IE9 Platform Preview Available for Developers |publisher=Microsoft |first=Dean |last=Hachamovitch |date=2010-06-23 |accessdate=2010-08-23 |archive-date=2010-06-26 |archive-url=https://web.archive.org/web/20100626005525/http://blogs.msdn.com/b/ie/archive/2010/06/23/html5-native-third-ie9-platform-preview-available-for-developers.aspx |dead-url=no }}</ref>
| 83／100<ref>{{citation |url=http://ie.microsoft.com/testdrive/benchmarks/Acid3-pp3/Default.html |title=The Web Standards Project's Acid3 Test — Platform Preview 3 |publisher=Microsoft |deadurl=yes |archiveurl=https://web.archive.org/web/20100814155951/http://ie.microsoft.com/testdrive/benchmarks/Acid3-pp3/Default.html |archivedate=2010-08-14 |accessdate=2010-08-23 }}</ref>
| [[排版引擎比較 (HTML5媒體)|HTML5 audio]]、video和[[Canvas (HTML元素)|canvas]]標籤和[[Web開放字型格式|WOFF]]。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 4
| 1.9.7916.6000
| 2010年8月4日<ref>{{citation |url=http://blogs.msdn.com/b/ie/archive/2010/08/04/html5-modernized-fourth-ie9-platform-preview-available-for-developers.aspx |title=HTML5, Modernized: Fourth IE9 Platform Preview Available for Developers |date=2010-08-04 |first=Dean |last=Hachamovitch |publisher=Microsoft |accessdate=2010-08-23 |archive-date=2011-04-11 |archive-url=https://web.archive.org/web/20110411015325/http://blogs.msdn.com//b//ie//archive//2010//08//04//html5-modernized-fourth-ie9-platform-preview-available-for-developers.aspx |dead-url=no }}</ref>
| rowspan="7" | 95／100<ref>{{citation |url=http://ie.microsoft.com/testdrive/benchmarks/Acid3/Default.html |title=The Web Standards Project's Acid3 Test — Platform Preview 4 |publisher=Microsoft |deadurl=yes |archiveurl=https://web.archive.org/web/20100322192858/http://ie.microsoft.com/testdrive/benchmarks/Acid3/Default.html |archivedate=2010-03-22 |accessdate=2010-08-23 }}</ref>
|JavaScript引擎嵌入到核心瀏覽器組件<ref>{{cite web|url=http://arstechnica.com/microsoft/news/2010/08/microsoft-releases-final-internet-explorer-9-platform-preview.ars|title=Inside the final Internet Explorer 9 Platform Preview|publisher=arstechnica|access-date=2010-08-23|archive-date=2012-01-21|archive-url=https://web.archive.org/web/20120121175547/http://arstechnica.com/microsoft/news/2010/08/microsoft-releases-final-internet-explorer-9-platform-preview.ars}}</ref>。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 5
| 1.9.7930.16406
| rowspan="2" | 2010年9月15日<ref>{{citation |url=http://www.computerworld.com/s/article/9180659/Microsoft_to_release_IE9_public_beta_on_Sept._15 |title=Microsoft to release IE9 public beta on Sept. 15 |date=2010-08-13 |first=Gregg |last=Keizer |publisher=Computerworld |accessdate=2010-08-23 |archive-date=2014-07-31 |archive-url=https://web.archive.org/web/20140731222537/http://www.computerworld.com/s/article/9180659/Microsoft_to_release_IE9_public_beta_on_Sept._15 |dead-url=no }}</ref>
| 新的IE9圖示。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Beta
| 9.0.7930.16406
| 全新的使用者介面。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 6
| 1.9.8006.6000
| 2010年10月28日<ref>{{citation |url=http://www.downloadsquad.com/2010/10/28/ie9-beta-downloaded-10-million-times-more-details-on-developer/ |title=IE9 Beta downloaded 10 million times, more details on Developer Preview 6 |date=2010-10-28 |first=Sebastian |last=Anthony |publisher=Download Squad |accessdate=2011-02-11 |archive-date=2010-11-04 |archive-url=https://web.archive.org/web/20101104095659/http://www.downloadsquad.com/2010/10/28/ie9-beta-downloaded-10-million-times-more-details-on-developer/ |dead-url=no }}</ref>
| CSS3的2D轉換和HTML5語意標籤<ref name="preview-6">{{cite web |url = http://blogs.msdn.com/b/ie/archive/2010/10/28/html5-using-the-whole-pc-sixth-ie9-platform-preview-available-for-developers.aspx |title = HTML5, Using the whole PC: Sixth IE9 Platform Preview Available for Developers |publisher = Microsoft |last = Hachamovitch |first = Dean |date = 2010-10-28 |accessdate = 2010-10-28 |archive-date = 2012-04-25 |archive-url = https://www.webcitation.org/67CGUzTr6?url=http://blogs.msdn.com/b/ie/archive/2010/10/28/html5-using-the-whole-pc-sixth-ie9-platform-preview-available-for-developers.aspx |dead-url = no }}</ref>。
|-
| style="white-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 7
| 1.9.8023.6000
| 2010年11月17日<ref name="preview-7">{{cite web |url = http://blogs.msdn.com/b/ie/archive/2010/11/17/html5-and-real-world-site-performance-seventh-ie9-platform-preview-available-for-developers.aspx |title = HTML5, and Real World Site Performance: Seventh IE9 Platform Preview Available for Developers |publisher = Microsoft |last = Hachamovitch |first = Dean |date = 2010-11-17 |accessdate = 2010-11-17 |archive-date = 2012-04-25 |archive-url = https://www.webcitation.org/67CGW6TAQ?url=http://blogs.msdn.com/b/ie/archive/2010/11/17/html5-and-real-world-site-performance-seventh-ie9-platform-preview-available-for-developers.aspx |dead-url = no }}</ref>
| 改善JavaScript性能。
|-
| style="red-space:nowrap; background:LightPink;"| Internet Explorer 9 Platform Preview 8
| 1.9.8080.16413
| rowspan="2" | 2011年2月10日<ref name="IE 9 RC to be released February 2011">{{cite web |url = http://www.neowin.net/news/internet-explorer-9-rc-to-launch-on-february-10 |title = Internet Explorer 9 RC to launch on February 10 |publisher = Neowin.net |last = Brad |first = Sams |date = 2011-02-10 |accessdate = 2011-02-04 |archive-date = 2012-04-25 |archive-url = https://www.webcitation.org/67CGWwMVx?url=http://www.neowin.net/news/internet-explorer-9-rc-to-launch-on-february-10 |dead-url = no }}</ref>
| 效能改進、互動性增強、允許網站追蹤瀏覽者位置。
|-
| style="red-space:nowrap; background:LightPink;"| Internet Explorer 9 Release Candidate
| 9.0.8080.16413
| 效能改進、追蹤保護功能、改良使用者介面、支援更多網頁標準。
|-
| style="green-space:nowrap; background:#a0e75a;"|Internet Explorer 9 Final Release
| 9.0.8112.16421
| 2011年3月14日<ref name="IE9 launching March 14"/>
| 100／100<ref name=acid3updated>{{citation |url=http://www.tomsguide.com/us/acid3-browser-test-web-standard-compatibility-IE9,news-12583.html |title=Acid3 Test Simplified |publisher=Tom's Hardware |access-date=2016-08-13 |archive-url=https://web.archive.org/web/20130502100411/http://www.tomsguide.com/us/acid3-browser-test-web-standard-compatibility-IE9,news-12583.html |archive-date=2013-05-02 |dead-url=yes }}</ref>
| 效能改進、釘選工具列選項、「請勿追蹤」（Do-not-track）工具。
|}

== 開發 ==
IE9在IE8發佈不久之後開始開發。微軟在IE8發佈之後開始通過Microsoft Connect徵集建議<ref>{{citation |url=http://news.softpedia.com/news/Forget-about-IE8-Onward-to-Internet-Explorer-9-in-Windows-7-74575.shtml |title=Forget about IE8 - Onward to Internet Explorer 9 in Windows 7 |last=Oiaga |first=Marius |date=2007-12-20 |publisher=[[Softpedia]] |accessdate=2010-03-19 |archive-date=2020-08-09 |archive-url=https://web.archive.org/web/20200809101503/https://news.softpedia.com/news/Forget-about-IE8-Onward-to-Internet-Explorer-9-in-Windows-7-74575.shtml |dead-url=no }}</ref>。目前，IE開發團隊專注於加強對[[HTML5]]、[[CSS3]]、[[SVG]]、[[XHTML]]、[[JavaScript]]、硬體加速支援和效能改進，以及具有敏捷性和「一個簡潔的新設計」的使用者介面<ref>{{Cite news|url=http://blogs.msdn.com/b/ie/archive/2010/09/15/ie9-beta-available-for-download.aspx|title=Introducing Internet Explorer 9 Beta — Internet Explorer Blog at MSDN|work=Microsoft Developer Network|publisher=Microsoft|date=2010-09-15|accessdate=2010-11-30|archive-date=2011-04-23|archive-url=https://web.archive.org/web/20110423193459/http://blogs.msdn.com/b/ie/archive/2010/09/15/ie9-beta-available-for-download.aspx|dead-url=no}}</ref>。

微軟在PDC 2009首次公佈了IE9，主要談及IE9將如何利用[[DirectX]]中的硬件加速改善[[網絡應用程序]]的性能和提升網頁排版的品質。

隨後，微軟宣佈加入[[W3C]]的SVG工作組，引發關於IE9將支援SVG的[[W3C推薦標準]]的猜測<ref>{{cite web|url=http://blogs.msdn.com/ie/archive/2009/11/18/an-early-look-at-ie9-for-developers.aspx|title=An Early Look At IE9 for Developers|date=2009-11-18|first=Dean|last=Hachamovitch|work=IEBlog on [[Microsoft Developer Network]]|publisher=[[Microsoft]]|accessdate=2009-11-18|archive-date=2010-02-08|archive-url=https://web.archive.org/web/20100208214559/http://blogs.msdn.com/ie/archive/2009/11/18/an-early-look-at-ie9-for-developers.aspx|dead-url=no}}</ref>。這些猜測隨著微軟在MIX 10上演示對基本SVG標記的支援得到證實。微軟同時宣佈IE9在第一個預覽版發佈時對SVG的支援將大幅改進。IE開發團隊亦對IE9利用的新JavaScript引擎進行介紹。新的JavaScript引擎代號為「Chakra」，可以將JavaScript代碼[[即時編譯]]成原生代碼來執行<ref name="autogenerated1">{{cite web |url=http://blogs.msdn.com/b/ieinternals/archive/2009/05/29/q-a-64-bit-internet-explorer.aspx |title=Q&A: 64-Bit Internet Explorer |author=Eric Law |date=2009-05-29 |publisher=Microsoft |work=MSDN Blogs > EricLaw's IEInternals |archiveurl=https://www.webcitation.org/5xLWkEWWv?url=http://blogs.msdn.com/b/ieinternals/archive/2009/05/29/q-a-64-bit-internet-explorer.aspx |archivedate=2011-03-21 |deadurl=yes |accessdate=2016-08-13 }}</ref><ref>{{citation |url=http://news.softpedia.com/news/Internet-Explorer-9-Beta-Next-New-IE9-Builds-Every-8-Weeks-138013.shtml |title=Internet Explorer 9 Beta Next – New IE9 Builds Every 8 Weeks |last=Oiaga |first=Marius |date=2010-03-20 |publisher=[[Softpedia]] |accessdate=2010-03-31 |archive-date=2012-05-01 |archive-url=https://www.webcitation.org/67KMEkgUi?url=http://news.softpedia.com/news/Internet-Explorer-9-Beta-Next-New-IE9-Builds-Every-8-Weeks-138013.shtml |dead-url=yes }}</ref><ref>{{citation |url=http://blogs.msdn.com/ie/archive/2010/01/05/microsoft-joins-w3c-svg-working-group.aspx |title=Microsoft Joins W3C SVG Working Group |date=2010-01-05 |first=Patrick |last=Dengler |work=IEBlog on [[Microsoft Developer Network]] |publisher=[[Microsoft]] |accessdate=2009-01-05 |archive-date=2010-01-08 |archive-url=https://web.archive.org/web/20100108081123/http://blogs.msdn.com/ie/archive/2010/01/05/microsoft-joins-w3c-svg-working-group.aspx |dead-url=no }}</ref>。

在MIX 10上，微軟發佈了第一個IE9預覽版，包含對CSS 3和SVG支援和一個名為「Chakra」的新JavaScript引擎。它的[[Acid3]]測試得分為55 ／100，高於IE8的20／100。2010年5月5日，微軟發佈第二個IE9預覽版，Acid3得分為68／100，並在[[WebKit]] SunSpider JavaScript性能測試中表現較第一個平台預覽版為佳。2010年6月23日，微軟發佈第三個IE9預覽版，Acid3得分為83／100，JavaScript引擎性能再次得到改進，並新增了對HTML5 <code>video</code>、<code>audio</code>、<code>canvas</code>標籤以及開放字型格式的支援。2010年8月4日，微軟發佈第四個IE9預覽版，Acid3得分為95／100。

這些預覽不是IE9的完整版本，目的只在於測試最新版本的[[Trident (排版引擎)|Trident]]排版引擎。它們供網頁開發者提供關於新增功能的反饋所用，可以和其他已經安裝的瀏覽器共存；它們只是渲染技術的預覽，只包含一個精簡的用戶界面，沒有網址列和導航按鈕等傳統的界面元素<ref>{{citation |url=http://ie.microsoft.com/testdrive/info/FrequentlyAskedQuestions/Default.html |title=Frequently Asked Questions |date=2010-03-13 |accessdate=2010-03-18 |publisher=[[Microsoft]] |deadurl=yes |archiveurl=https://web.archive.org/web/20100322193213/http://ie.microsoft.com/testdrive/info/FrequentlyAskedQuestions/Default.html |archivedate=2010-03-22 }}</ref>。微軟稱這些預覽版本每隔約八個星期更新一次。

2010年9月4日，微軟發佈IE9 Beta，包含完整的使用介面。

2011年2月10日，微軟發佈IE9 RC，包含追蹤保護功能，及改良的使用介面。

2011年3月15日晚上9點，微軟在德克薩斯州奧斯汀市[[西南偏南|SXSW]]音樂和電影節發佈IE9 RTM正式版<ref name="IE9 launching March 14" />。

== 對於舊版IE改善 ==
=== 新使用界面 ===
IE9改善了使用界面，比IE8介面更簡潔，並增加與Windows 7的整合。並且資訊列會出現在下方，比舊版的IE較不會影響到使用者瀏覽網頁。
對Windows 7增強的支援包括：

* 可以將網站釘選後以符合網頁色彩的半透明彩色視窗啟動
* 跳躍清單，在圖示按右鍵即可存取最常造訪的網站
* 某些已釘選的網站還會有圖示覆疊，提供網站狀態相關資訊。例如，新郵件數量會顯示在工作列的圖示上。如此一來，可以不必移至網站就能掌握最新資訊
* 可以透過將索引標籤移動至其他地方而將網頁改以另外一個視窗瀏覽，也可以將網站移回原本視窗的標題列關閉原本瀏覽網頁的視窗並改以移動到的視窗瀏覽

=== JavaScript引擎 ===
{{Main|Chakra (JScript引擎)}}
IE9嵌入名為Chakra的新JavaScript引擎作為核心瀏覽器組件。Chakra有一個單獨的背景線程編譯的JavaScript。Windows運行在該線程並行時，在一個單獨的核心之一是可用。編制背景使用戶能夠保持與互動網頁，而IE9產生更快的代碼。分別通過運行在後台，這個過程還可以充分利用現代多核心的機器<ref>{{citation |url=http://blogs.msdn.com/b/ie/archive/2010/03/16/html5-hardware-accelerated-first-ie9-platform-preview-available-for-developers.aspx |title=HTML5, Hardware Accelerated: First IE9 Platform Preview Available for Developers |first=Dean |last=Hachamovitch |date=2010-03-16 |accessdate=2016-08-13 |archive-date=2011-08-05 |archive-url=https://web.archive.org/web/20110805023212/http://blogs.msdn.com/b/ie/archive/2010/03/16/html5-hardware-accelerated-first-ie9-platform-preview-available-for-developers.aspx |dead-url=no }}</ref>。

在初步根據SunSpider基準第三IE9 RC版本，它勝過了IE8的引擎，成績亦超過當時最新的[[Firefox 4.0]]<ref>{{citation|url=http://news.softpedia.com/news/IE9-Races-for-Fastest-Browsers-in-the-World-Spot-with-Chrome-Firefox-Opera-and-Safari-145545.shtml|title=IE9 Races for Fastest Browsers in the World Spot with Chrome, Firefox, Opera and Safari|date=2010-06-26|publisher=Softpedia.com|accessdate=2016-08-13|archive-date=2020-08-09|archive-url=https://web.archive.org/web/20200809103549/https://news.softpedia.com/news/IE9-Races-for-Fastest-Browsers-in-the-World-Spot-with-Chrome-Firefox-Opera-and-Safari-145545.shtml|dead-url=no}}</ref>。微軟採用了[[死碼刪除]]的優化技術讓新的JavaScript引擎擁有更快的性能<ref>{{citation|url=http://blogs.msdn.com/b/ie/archive/2010/11/17/html5-and-real-world-site-performance-seventh-ie9-platform-preview-available-for-developers.aspx|title=HTML5, and Real World Site Performance: Seventh IE9 Platform Preview Available for Developers|date=2010-11-17|accessdate=2011-02-11|archive-date=2012-04-25|archive-url=https://www.webcitation.org/67CGW6TAQ?url=http://blogs.msdn.com/b/ie/archive/2010/11/17/html5-and-real-world-site-performance-seventh-ie9-platform-preview-available-for-developers.aspx|dead-url=no}}</ref>，但是根據Mozilla開發者Robert Sayre進一步研究發現，Internet Explorer 9無效代碼消除存在缺陷，導致測試成績大幅提升<ref>{{cite web |url=http://blog.mozilla.com/rob-sayre/2010/11/17/dead-code-elimination-for-beginners/ |title=Dead Code Elimination for Beginners |first=Rob |last=Sayre |date=2010-11-17 |accessdate=2010-11-18 |deadurl=yes |archiveurl=https://web.archive.org/web/20101119020732/http://blog.mozilla.com/rob-sayre/2010/11/17/dead-code-elimination-for-beginners/ |archivedate=2010-11-19 }}</ref>。

Chakra引擎顯著提高支援ECMA-262（[[ECMAScript]]的語言規範標準），包括新的功能，最近完成的第五版的ECMA-262（通常簡稱ES5）<ref>{{citation |url=http://blogs.msdn.com/b/ie/archive/2010/07/16/how-ie9-platform-preview-feedback-changed-the-javascript-standard.aspx |title=How IE9 Platform Preview Feedback Changed the JavaScript Standard |first=Allen |last=Wirfs-Brock |date=2010-07-16 |publisher=Microsoft |accessdate=2016-08-13 |archive-date=2010-07-20 |archive-url=https://web.archive.org/web/20100720193312/http://blogs.msdn.com/b/ie/archive/2010/07/16/how-ie9-platform-preview-feedback-changed-the-javascript-standard.aspx |dead-url=no }}</ref>。

=== DOM ===
增強的DOM功能：
* 將XML剖析與序列化至DOM，並從DOM剖析與序列化XML
* 全新的DOM層級2（L2）與層級3（L3）支援以及更新的行為
* DOM核心（L2、L3）與檢視（L2）
* DOM元素周遊
* DOM事件（L2、L3）
* DOM L2 HTML
* DOM L2樣式
* DOM L2周遊與範圍

=== CSS ===
{{See also|瀏覽器引擎CSS支援比較}}
增強的[[CSS3]]支援：
* 對CSS3背景和邊框
* CSS3字型屬性與全新的網頁字型格式
* CSS3媒體查詢
* CSS3值與單位
* CSS3命名空間
* CSS3值與單位
* CSS3選擇器

=== HTML5 ===

==== HTML5 Media ====
{{main|排版引擎比較 (HTML5媒體)}}
IE9支援HTML5<code>video</code>和<code>audio</code>標籤。

<code>audio</code>標籤將包括原生支援[[MP3]]和[[進階音訊編碼|AAC]]解碼器，而影片標籤將原生支援[[H.264/MPEG-4 AVC]]<ref name="prev3-media">{{citation |url=http://news.softpedia.com/news/IE9-Platform-Preview-3-HTML5-Evolution-Canvas-Video-and-Audio-Elements-Now-Supported-145416.shtml |title=IE9 Platform Preview 3 HTML5 Evolution: Canvas, Video and Audio Elements Now Supported |first=Marius |last=Oiaga |publisher=[[Softpedia]] |accessdate=2016-08-13 |archive-date=2020-08-09 |archive-url=https://web.archive.org/web/20200809161141/https://news.softpedia.com/news/IE9-Platform-Preview-3-HTML5-Evolution-Canvas-Video-and-Audio-Elements-Now-Supported-145416.shtml |dead-url=no }}</ref>。[[WebM]]影片支援將需要第三方外掛程式<ref name="prev3-media"/>。

==== HTML5 Canvas ====
{{main|排版引擎比較 (HTML5畫布)}}
IE9支援HTML5<code>canvas</code>標籤。

==== HTML5 Inline SVG支援 ====
* 嵌入方法：inline HTML、inline XHTML、<object>、full .svg documents
* 結構：{{tag|svg|open}}、{{tag|defs|open}}、{{tag|use|open}}、{{tag|g|open}}、{{tag|image|open}}
* 圖形：{{tag|circle|open}}、{{tag|ellipse|open}}、{{tag|rect|open}}、{{tag|line|open}}、{{tag|polyline|open}}、{{tag|polygon|open}}、{{tag|path|open}}
* 文本
* 填滿、CSS3顏色
* DOML2核心和SVGDOM
* Events
* Presentation Attributes and CSS Styling
* 轉換：<code>translate</code>、<code>skewX</code>、<code>skewY</code>、<code>scale</code>、<code>rotate</code><ref>{{citation |url=http://www.w3.org/TR/SVG/coords.html#TransformAttribute |title=Coordinate Systems, Transformations and Units - The <code>transform</code> attribute |publisher=W3C |date=2003-01-14 |accessdate=2010-06-24 |archive-date=2021-01-26 |archive-url=https://web.archive.org/web/20210126025803/http://www.w3.org/TR/SVG/coords.html#TransformAttribute |dead-url=no }}</ref>
* 嵌入方法：{{tag|embed|open}}、{{tag|iframe|open}}、{{tag|img|open}}、css image、.svgz
* 漸變與模式
* 裁剪，掩蔽，與合成
* 光標，標記
* 其餘文本，轉換

=== 網頁排版 ===
IE是第一個支援Web字體的<code>@font-face</code>規定的瀏覽器，但早期只支援[[嵌入式OpenType]]格式，而且缺乏支援部分的對CSS3字體模塊<ref>{{citation |url=http://webfonts.info/wiki/index.php?title=@font-face_support_in_Internet_Explorer |title=@font-face support in Internet Explorer |publisher=Webfonts.info |deadurl=yes |archiveurl=https://web.archive.org/web/20100719075930/http://webfonts.info/wiki/index.php?title=%40font-face_support_in_Internet_Explorer |archivedate=2010-07-19 |accessdate=2010-08-19 }}</ref>。IE9完成支援模塊和增加對CSS3字體[[Web開放字型格式|WOFF]]的支援。

== 參考資料 ==
{{Reflist|2}}

{{Internet Explorer}}
{{Web browser}}
{{網頁瀏覽器時間線}}

[[Category:Internet Explorer|9]]
[[Category:網際網路歷史]]
[[Category:2011年軟體]]

Internet Explorer 9 - 版本历史

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