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Embedded OpenType

January 01, 1970

Embedded OpenType (EOT) fonts are a compact form of OpenType fonts designed by Microsoft for use as embedded fonts on web pages. These files use the extension .eot. They are supported only by Microsoft Internet Explorer, as opposed to competing WOFF files.

Embedded OpenType
Filename extension
.eot
Internet media type
application/vnd.ms-fontobject
Type of formatoutline font

Overview edit

EOT font files can be created from existing TrueType font files using Microsoft's Web Embedding Fonts Tool (WEFT), and other proprietary and open source software (see “External links” below).

The font files are made small in size by use of subsetting (only including the needed characters), and by data compression (LZ compression, part of Agfa's MicroType Express). Like OTF fonts, EOT supports both Postscript and TrueType outlines for the glyphs.[1]

Simply including fonts in webpages might lead to unrestricted copying of copyrighted font files. Embedded OpenType includes features to discourage copying. Subsetting reduces the value of copying, as subsetted fonts will typically omit more than half of the characters. Other copy protection measures used are encryption and a list of "trusted roots" at the source end, and a proprietary decrypting library at the receiving end.

If the embedded font is not available to the web page for any reason (missing font file, wrong keys in the file, non-support by the web browser), then the second-choice font specification is used, ensuring that the page should be readable even without the intended font.

Embedded OpenType is a proprietary standard supported exclusively by Internet Explorer but was submitted to the W3C in 2007 as part of CSS3, which was rejected and resubmitted as a standalone submission March 18, 2008. The W3C team comment on the submission states that the "W3C plans to submit a proposal to the W3C members for a working group whose goal is to try and develop EOT into a W3C Recommendation." However, the W3C ultimately chose a different web font format (WOFF) as a W3C Recommendation.[2] The support for the format has not been built into the Microsoft Edge, the successor to the Internet Explorer.

Web Embedding Fonts Tool edit

The Web Embedding Fonts Tool, or WEFT, is Microsoft's utility for generating embeddable web fonts.

WEFT is used by webmasters to create 'font objects' that are linked to their web pages so that users using Microsoft's Internet Explorer web browser will see the pages displayed in the font style contained within the font object.

WEFT scans the HTML document file(s), the TrueType font file(s), and some additional parameters. It adjusts the HTML files and creates Embedded OpenType files for inclusion on the web site. These files usually use the extension '.eot'.

WEFT can embed most fonts, but it will not embed fonts that have been designated as 'no embedding' fonts by their designers. WEFT may reject other fonts because problems have been identified.

In the past, embedded fonts were widely used to generate non-English-language websites.

As of January 2015, the most recent version of the tool (WEFT 3.2) was released on 25 February 2003. As of 2019, the tool is no longer offered by Microsoft for download.

An open source alternative is 'ttf2eot'.

Microsoft PowerPoint 2007 and 2010 also generate .eot files with the '.fntdata' [1] extension when fonts are selected to be embedded in a presentation by the PowerPoint client application. These .eot files can be extracted from the '.pptx' file and used directly on web pages.

Security issues edit

Critical security update for Windows Vista KB969947 resolves several security issues that "could allow remote code execution if a user viewed content rendered in a specially crafted Embedded OpenType (EOT) font". Such fonts could be embedded in Web sites, including those that host user-provided content.[3]

See also edit

References edit

  1. ^ "The Typekit Blog | Type rendering: Font outlines and file formats".
  2. ^ Web Fonts - W3C
  3. ^ "Microsoft Security Bulletin MS09-065 – Critical Vulnerabilities in Windows Kernel-Mode Drivers Could Allow Remote Code Execution (969947)". Microsoft. 2009-11-10.

External links edit

  • EOT-utils – open-source free software to make EOT fonts by W3C
  • ttf2eot – open-source free software to convert font from TTF to EOT
  • CSS2: Fonts
  • Compatibility table for support of EOT fonts in browsers
  • W3C Submission describing the format
  • Minutes of the W3C Fonts Working Group, 23 October 2008
  • MIME registration
  • Google Web Fonts

January 01, 1970
embedded, opentype, fonts, compact, form, opentype, fonts, designed, microsoft, embedded, fonts, pages, these, files, extension, they, supported, only, microsoft, internet, explorer, opposed, competing, woff, files, filename, extension, eotinternet, media, typ. Embedded OpenType EOT fonts are a compact form of OpenType fonts designed by Microsoft for use as embedded fonts on web pages These files use the extension eot They are supported only by Microsoft Internet Explorer as opposed to competing WOFF files Embedded OpenTypeFilename extension eotInternet media typeapplication vnd ms fontobjectType of formatoutline font Contents 1 Overview 2 Web Embedding Fonts Tool 3 Security issues 4 See also 5 References 6 External linksOverview editEOT font files can be created from existing TrueType font files using Microsoft s Web Embedding Fonts Tool WEFT and other proprietary and open source software see External links below The font files are made small in size by use of subsetting only including the needed characters and by data compression LZ compression part of Agfa s MicroType Express Like OTF fonts EOT supports both Postscript and TrueType outlines for the glyphs 1 Simply including fonts in webpages might lead to unrestricted copying of copyrighted font files Embedded OpenType includes features to discourage copying Subsetting reduces the value of copying as subsetted fonts will typically omit more than half of the characters Other copy protection measures used are encryption and a list of trusted roots at the source end and a proprietary decrypting library at the receiving end If the embedded font is not available to the web page for any reason missing font file wrong keys in the file non support by the web browser then the second choice font specification is used ensuring that the page should be readable even without the intended font Embedded OpenType is a proprietary standard supported exclusively by Internet Explorer but was submitted to the W3C in 2007 as part of CSS3 which was rejected and resubmitted as a standalone submission March 18 2008 The W3C team comment on the submission states that the W3C plans to submit a proposal to the W3C members for a working group whose goal is to try and develop EOT into a W3C Recommendation However the W3C ultimately chose a different web font format WOFF as a W3C Recommendation 2 The support for the format has not been built into the Microsoft Edge the successor to the Internet Explorer Web Embedding Fonts Tool editThe Web Embedding Fonts Tool or WEFT is Microsoft s utility for generating embeddable web fonts WEFT is used by webmasters to create font objects that are linked to their web pages so that users using Microsoft s Internet Explorer web browser will see the pages displayed in the font style contained within the font object WEFT scans the HTML document file s the TrueType font file s and some additional parameters It adjusts the HTML files and creates Embedded OpenType files for inclusion on the web site These files usually use the extension eot WEFT can embed most fonts but it will not embed fonts that have been designated as no embedding fonts by their designers WEFT may reject other fonts because problems have been identified In the past embedded fonts were widely used to generate non English language websites As of January 2015 the most recent version of the tool WEFT 3 2 was released on 25 February 2003 As of 2019 the tool is no longer offered by Microsoft for download An open source alternative is ttf2eot Microsoft PowerPoint 2007 and 2010 also generate eot files with the fntdata 1 extension when fonts are selected to be embedded in a presentation by the PowerPoint client application These eot files can be extracted from the pptx file and used directly on web pages Security issues editCritical security update for Windows Vista KB969947 resolves several security issues that could allow remote code execution if a user viewed content rendered in a specially crafted Embedded OpenType EOT font Such fonts could be embedded in Web sites including those that host user provided content 3 See also editWeb typography Web Open Font Format WOFF References edit The Typekit Blog Type rendering Font outlines and file formats Web Fonts W3C Microsoft Security Bulletin MS09 065 Critical Vulnerabilities in Windows Kernel Mode Drivers Could Allow Remote Code Execution 969947 Microsoft 2009 11 10 External links editMicrosoft Typography Font Embedding for the Web Microsoft Typography Web Embedding Fonts Tool EOT utils open source free software to make EOT fonts by W3C ttf2eot open source free software to convert font from TTF to EOT CSS2 Fonts Compatibility table for support of EOT fonts in browsers W3C Submission describing the format Minutes of the W3C Fonts Working Group 23 October 2008 MIME registration Google Web Fonts Retrieved from https en wikipedia org w index php title Embedded OpenType amp oldid 1194023220, wikipedia, wiki, book, books, library,

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