Knowledge (XXG)

:Manual of Style/Accessibility/Alternative text for images - Knowledge (XXG)

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be used. It is Knowledge (XXG)'s policy to link those images for attribution, and linked images must have a non-blank alt attribute to prevent empty links, which result in confusing announcements in screen readers. When a blank alt attribute is desired, consider replacing CC BY-SA images with public
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With maps, diagrams and charts, the colour, position, and size of elements are not important. Instead, concentrate on the information being presented. For example, a chart may have alternative text "Sales in June exceeded those in July, and August's were higher still", and a diagrammatic animation
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Alternative text should be short, such as "A basketball player" or "Tony Blair shakes hands with George W. Bush". If it needs to be longer, the important details should appear in the first few words, allowing the user of a screen reader to skip forward once the key points are understood. Very long
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WebAim writes: "he alt attribute (sometimes called the alt tag, though technically this is incorrect) is not the only mechanism for providing the content and function of the image. This information can also be provided in text adjacent to the image or within the page containing the image. ... The
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Images are typically thumbnails with captions. The caption is visible to all readers, and can contain HTML markup, wikilinks and inline citations. An infobox often contains a plain image with the caption as a separate row. A good caption should succinctly identify the subject of the image and
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When the image type is specified in such a way that a caption is not visible without hovering over the image, which occurs in such places as the Main Page, the caption text is automatically used as the alt text, which almost always suffices (see the extended image syntax link above).
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Similar problems exist for an image that strictly repeats the information found in nearby text or in a caption. The nearby text is sufficient as the image's alternative text. A non-blank alt attribute results in repetitive text for screen readers and search engines.
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Most images in Knowledge (XXG) articles do not serve an active function; they are not buttons or menu options. Where the image serves as a link to another article, name the article in the alternative text. Where following the link performs an operation (such as
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The purpose of the image, an icon, is to provide a link to the Commons search page. The appearance of the icon is not important, but its function is. By writing the alternative text in the "caption" field of the image markup, it is both the
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An image that is purely decorative (provides no information and serves only an aesthetic purpose) requires no alternative text. Often the caption fully meets the requirements for alternative text. However, the only situation where blank
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The purpose of the image is to show what Denmark's Dannebrog flag looks like. The photograph could be replaced by a flat graphic and serve the same purpose. Therefore, the flagpole, the fluttering and the sky are not important.
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text is available. This is usually not helpful. In the above Napoleon example, the screen reader would have read out "link graphic slash Jacques hyphen Louis underscore David underscore zero one seven" had we not supplied the
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attribute is empty or missing. Nearly all images in Knowledge (XXG) articles are links to the image description page, which contains a larger size version of the image, as well as licensing and attribution information.
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Knowledge (XXG) articles sometimes contain images that do not link to an image page, for example an Information icon. Such images should be configured so they are ignored by screen readers. This is achieved by adding
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term alternative text, as used in this article, refers to the text equivalent for an image, regardless of where that text resides. It does not refer solely to the alt attribute of the image tag. See WebAIM.
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text "About this image". All these are repeated as link title text, which provides a tooltip in some browsers, with the exception of the base image, which has link title "1896 Democrats Website".
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found in the text should have alt attributes that describe their function, not their appearance. For example, an arrow icon used to navigate to the following page should have an alt attribute of
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The image provides visual structure but no essential information. Since the image is in the public domain, no attribution is required and the link can be dropped, allowing us to specify a blank
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parameter text ("Painting of Napoleon Bonaparte") is not normally visible to readers; however, it may be displayed by web browsers when images are switched off, or read out loud by
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If an image contains words important to the reader's understanding, the alternative text should contain those words. If it contains non-Latin characters, consider providing a
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for those with visual impairment, and can be used by search engines to determine the content of the image. In keeping with other Internet guidelines, the term "
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parameter to translate it to English. More complex formulae are hard to specify and the original markup may be the best option, which is the default if no
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Where the caption is sufficiently descriptive or evocative of the image, or where it makes clear what the function of the image is, one option is to write
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parameter be absent. This is because a screen reader, in order to describe the purpose of the link, will default to reading out the image filename when no
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Tony Blair and George W. Bush shaking hands at a press conference. Blair and Bush agree on a strategy for peace in the Middle East on 12 November 2004.
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text is acceptable is where such images are unlinked, which is rarely possible. One solution is to provide something at least minimally useful such as
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G74: Providing a long description in text near the non-text content, with a reference to the location of the long description in the short description
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text shouldn't say they were in the East Room of the White House, because that isn't clear from the photograph. That the men are dressed identically
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G94: Providing short text alternative for non-text content that serves the same purpose and presents the same information as the non-text content
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Experiencing Knowledge (XXG) with a screen reader requires practice. An experienced screen-reader user may choose to skip portions of the text.
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The image strictly repeats the information conveyed by the adjacent word "Warning". Since "Warning" is sufficient alternative text, a blank
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File:Bryan-Sewall.jpg|thumb|upright=0.75|center|alt=1896 Democratic campaign poster circle 950 850 700 ] circle 2950 850 700 ] default
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attribute. This is because the screen reader must read SOMETHING to identify the link." The screen reader emulator Fangs confirms this.
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The base image has alt text "1896 Democratic campaign poster". The left circle has alt text "William J. Bryan". The right circle has
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an article on great military leaders where it illustrates an example of such a leader—the alternative text should name the subject;
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This is a stock photograph chosen to decorate a sound bite from the article regarding tap water. The image is a link so it needs
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tag. When the image is a link, screen readers will read out the link filename (e.g., "slash green underscore tick") if the HTML
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text shouldn't say "Two men shaking hands", because that's not why the picture was chosen; it needs to identify the men. The
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illustrating what he looked like—the alternative text should briefly describe his appearance if it matters to the article;
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is used to generate math formulae. These may be rendered as an image or using text, depending on their complexity and
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text is intended to be read out by screen readers just before the caption, so avoid having the same details in both.
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text must be plain text (no HTML or wiki markup such as wikilinks) without line breaks. The text must comply with
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This page provides additional information about concepts in the page(s) it supplements. This page is not one of
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If I could not use the non-text content, what words would I use to convey the same function or information?
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For images that link to their image description page (which is nearly all images on Knowledge (XXG)), the
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For public domain, CC0, or similarly licensed images, unlink the image and use a blank alt attribute:
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attribute. This is because the screen reader must read SOMETHING to identify the link." See WebAIM,
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attribute, so the filename is not spoken by a screen reader. The combination of no link and a blank
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Alternative text allows the content and function of an image to be understood by text-only readers.
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F89: Failure (...) due to using null alt on an image where the image is the only content in a link
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Clear water pours from a spout. Fluoridation does not affect the appearance, taste or smell of
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WebAIM says: "An image that is the only thing inside a link must never have a missing or null
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On Knowledge (XXG), alternative text is typically supplied through a combination of the image
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WebAIM says "An image that is the only thing inside a link must never have a missing or null
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text. Because the caption does not identify the image, a brief description is appropriate.
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text, which in this case is identifying the picture. Each subsequent line specifies the
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Describing images on the Web: a survey of current practice and prospects for the future
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A red flag divided into four by a white cross slightly offset to the left. The oldest
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Readers with visual impairment of varying degrees who browse Knowledge (XXG) using a
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The image shows them greeting each other with a handshake during a press conference.
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Blair and Bush agree on a strategy for peace in the Middle East on 12 November 2004.
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to the image wiki markup. Removing the link is acceptable only for images in the
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text and the link title. The link title appears as a tooltip in some browsers.
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establish the image's relevance to the article, without detailing the obvious.
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text. If a template lacks such a parameter, consider asking that it be added.
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What frustrates screen reader users on the web: a study of 100 blind users
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Knowledge (XXG):Sock puppetry § Legitimate uses of alternative accounts
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Knowledge (XXG) essays and information pages about the Manual of Style
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may have alternative text "Animation of a car engine in motion". The
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H24: Providing text alternatives for the area elements of image maps
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Requirements for providing text to act as an alternative for images
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domain equivalents. Otherwise, use a brief alt attribute (such as
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attribute instructs screen readers to skip the image completely.
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text for a region link, which should be the purpose of the link.
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conveyed by the photograph, but it isn't relevant to the article.
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For details of the wiki markup that produces these elements, see
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Mercury, Venus, Earth, Mars. Jupiter, Saturn, Uranus, Neptune.
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Fluoridation does not affect the appearance, taste or smell of
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font) is used here to refer to the text supplied for the image
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Understanding Success Criterion 1.1.1; Understanding WCAG 2.0
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support have widely varying support for characters outside
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Knowledge (XXG):Extended image syntax#Alt text and caption
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Readers using browsers that do not support images (e.g.,
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For CC BY-SA, GFDL, or similarly licensed images, blank
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descriptions can be left for the body of the article.
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An image that provides no essential information is a
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Petrie, Helen; Harrison, Chandra; and Dev, Sundeep.
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Understanding the context of an image is vital. The
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should not be "an elderly woman wearing a black hat"
401:The Emperor Napoleon in His Study at the Tuileries 700:Comparison of three different types of toothbrush 608:Unless it appears in an article on fashion, the 1772:Knowledge (XXG) Manual of Style (accessibility) 1368: 810:In both cases, a blank alt attribute is ideal. 1747:, from the Australian Government Style Manual 958:also support it. For an example of using the 343: 8: 1630: 1628: 1572:Lazar J, Allen A, Kleinman J, Malarkey C. 447:parameter and which generates text for the 28:Knowledge (XXG):Alternative text for images 504:The audience for alternative text includes 350: 336: 141: 913:have their own parameters for specifying 1745:Alt text, captions and titles for images 1613:. Center for Persons with Disabilities, 1605: 1603: 1601: 1599: 1597: 1595: 1290: 1082: 79:Knowledge (XXG)'s policies or guidelines 70:Manual of Style accessibility for images 1753:for checking the alt text on an article 1542: 1519: 989:text. When using tables instead, add a 144: 1396:First line specifies the base image's 1056: 1053: 1032: 871: 865: 852: 848: 844: 840: 831: 827: 819: 816: 729: 723: 495:text to do so as briefly as possible. 488: 484: 480: 1552: 1550: 1548: 1546: 1166:national flag design still in use is 754:can be unambiguously described using 7: 1293:Unusual examples of alternative text 766:infoboxes include this information. 626:Web Content Accessibility Guidelines 514:that translates text into speech or 458:text cannot be blank nor should the 384:and the text supplied for the image 879:Alt text in templates and galleries 39:Knowledge (XXG):Alternative outlets 1767:Knowledge (XXG) supplemental pages 1500:Warning: Don't run with scissors. 1441:Jupiter, Saturn, Uranus, Neptune. 1428:Jupiter, Saturn, Uranus, Neptune. 635:What information is it presenting? 632:Why is this non-text content here? 83:thoroughly vetted by the community 35: 855:) to minimize the confusing text. 1489: 1435: 126: 55: 41:. For alternative accounts, see 1381:text "Arthur Sewall". The blue 1014:. For simple formulae, use the 18:Knowledge (XXG):Manual of Style 859:Icons that convey information 1: 1741:– in the HTML 5 specification 1674:, accessed 30 September 2020. 1644:, accessed 30 September 2020. 586:Biographies of living persons 547:How to write alternative text 1433:Mercury, Venus, Earth, Mars. 1411:Mercury, Venus, Earth, Mars. 1085:Examples of alternative text 665:article on a painting of him 638:What purpose does it fulfil? 985:generates an image with no 938:text since MediaWiki 1.18. 730:|alt=refer to adjacent text 195:Alternative text for images 1793: 1507:attribute is appropriate. 773: 680:. Screen readers without 588:. Since it cannot contain 224:Most widely used templates 90: 36: 1586:10.1080/10447310709336964 1578:Int J Hum Comput Interact 1497:Don't run with scissors. 1484:Don't run with scissors. 1338:Search Wikimedia Commons 1307: 1304: 1301: 1298: 1099: 1096: 1093: 1090: 872:|alt=arrow pointing right 672:Images that contain words 645:For example, an image of 622:World Wide Web Consortium 146:WikiProject Accessibility 1460: 1409: 1351: 1327:Search Wikimedia Commons 1313: 1242: 1188: 1105: 962:to create a gallery see 692:Captions and nearby text 561:does not support HTML's 411: 279:Resources and references 134:This page in a nutshell: 1642:Alternative Text Basics 1170:Denmark's 13th-century 1141:design still in use is 1110:design still in use is 801:purely decorative image 612:text for this image of 165:FAQ and common pitfalls 1373: 1328: 1257: 1211: 1152: 1022:parameter is supplied. 703: 617: 425: 408: 155:What is accessibility? 1726:, WCAG 2.0 technique. 1672:Context is Everything 1637:, WCAG 2.0 technique. 1615:Utah State University 1580:. 2007;22(3):247–69. 1372: 1326: 1255: 1205: 1136: 1027:Links and attribution 724:|alt=refer to caption 699: 607: 600:Importance of context 574:Neutral point of view 410: 398: 269:Manual of Style draft 251:Infobox accessibility 1688:; 11 December 2008 . 1561:; 11 December 2008 . 582:No original research 200:Data tables tutorial 160:Main discussion page 1699:Wikimedia bug 18682 1295: 1087: 658:article on Napoleon 539:Search-engine bots. 406:Jacques-Louis David 218:Template priorities 212:Template guidelines 81:as it has not been 1496: 1374: 1358:</imagemap: --> 1329: 1291: 1258: 1230:Water fluoridation 1212: 1153: 1083: 1063:or the equivalent 834:attributes should 756:IUPAC nomenclature 748:structural formula 704: 647:Napoleon Bonaparte 618: 563:longdesc attribute 449:HTML alt attribute 409: 312:Keyboard shortcuts 301:For impaired users 175:Article guidelines 1511: 1510: 1494: 1354:<imagemap: --> 1289: 1288: 1039:attribute in the 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94: 89: 84: 80: 73: 71: 67: 61: 54: 53: 48: 44: 40: 29: 23: 22:Accessibility 19: 1718: 1705: 1694: 1679: 1662: 1649: 1610: 1577: 1567: 1522: 1384: 1382: 1335: 1332: 1281: 1271: 1264: 1261: 1222: 1218: 1215: 1171: 1167: 1163: 1159: 1156: 1146: 1072: 1069: 1050: 1030: 996: 971: 963: 960:table syntax 920: 882: 870: 864: 860: 858: 835: 815: 809: 805: 800: 798: 791:MOS:BLANKALT 744: 735: 728: 722: 720: 716: 707: 701: 675: 644: 619: 614:Elizabeth II 567: 555: 542: 503: 502: 473: 453: 439:text" (in a 426: 399: 379: 366: 362: 361: 317:Style sheets 263:Coordination 133: 63: 1611:2020 WebAIM 1174:Dannebrog. 1137:The oldest 471:parameter. 274:Methodology 64:This is an 47:MOS:ALTNAME 1761:Categories 1538:References 1308:Rationale 1100:Rationale 518:, such as 307:Using JAWS 72:guidelines 68:about the 1299:Wikitext 1228:Article: 1177:Article: 1148:Dannebrog 1143:Denmark's 1091:Wikicode 1031:Writing " 975:Timelines 965:Galleries 934:supports 924:Galleries 891:templates 886:Templates 853:|alt=icon 776:Shortcuts 764:chemistry 559:MediaWiki 373:due to a 322:Toggle VF 241:Watchlist 101:WP:MOSALT 93:Shortcuts 1495:Warning: 1474:Warning: 1079:Examples 893:such as 758:and the 499:Audience 367:alt text 236:200–1000 20:‎ | 1336:graphic 1265:graphic 1219:graphic 1160:graphic 943:Gallery 898:Infobox 784:MOS:PDI 686:Latin-1 682:Unicode 516:Braille 382:caption 231:Top 200 108:MOS:ALT 1479:strong 1469:strong 1426:/: --> 1419:/: --> 1054:|link= 832:|link= 817:|link= 624:(W3C) 584:, and 552:Basics 1722:W3C. 1684:W3C. 1653:W3C. 1557:W3C. 1514:Notes 1482:: --> 1476:</ 1472:: --> 1420:]< 1057:|alt= 1033:|alt= 889:Many 851:, or 828:|alt= 820:|alt= 750:of a 487:, or 16:< 1466:< 1413:< 1389:has 1333:link 1272:The 1262:link 1223:link 1216:link 1179:Flag 1172:link 1168:link 1164:link 1157:link 1073:sort 1003:The 978:The 948:and 927:The 903:and 869:not 830:and 760:drug 568:The 534:Lynx 528:Orca 524:NVDA 520:JAWS 441:code 427:The 365:(or 1668:alt 1582:doi 1528:alt 1505:alt 1453:alt 1449:alt 1402:alt 1398:alt 1391:alt 1379:alt 1344:alt 1278:alt 1274:alt 1235:alt 1065:CC0 1045:alt 1041:img 1037:alt 1020:alt 1016:alt 1008:tag 987:alt 983:tag 936:alt 932:tag 915:alt 861:not 836:not 762:or 663:an 656:an 610:alt 594:alt 570:alt 526:or 493:alt 477:alt 469:alt 464:alt 460:alt 456:alt 445:alt 437:alt 429:alt 421:]]] 419:by 404:by 386:alt 1763:: 1627:^ 1617:. 1594:^ 1576:. 1545:^ 1423:br 1416:br 1282:is 1195:]] 1126:]] 1122:'' 1116:'' 956:}} 950:{{ 946:}} 940:{{ 911:}} 905:{{ 901:}} 895:{{ 847:, 843:, 733:. 688:. 580:, 576:, 522:, 506:: 483:, 417:'' 188:/ 74:. 1621:. 1588:. 1584:: 1463:] 1387:) 1385:i 1383:( 1316:] 1245:] 1210:. 1193:. 1191:] 1151:. 1124:. 1119:] 1112:] 1108:] 968:. 712:. 414:] 351:e 344:t 337:v 243:) 229:( 85:. 49:. 30:)

Index

Knowledge (XXG):Manual of Style
Accessibility
Knowledge (XXG):Alternative text for images
Knowledge (XXG):Alternative outlets
Knowledge (XXG):Sock puppetry § Legitimate uses of alternative accounts
MOS:ALTNAME
explanatory essay
Manual of Style accessibility for images
Knowledge (XXG)'s policies or guidelines
thoroughly vetted by the community
Shortcuts
WP:MOSALT
MOS:ALT
WikiProject Accessibility
What is accessibility?
Main discussion page
FAQ and common pitfalls
Dos and don'ts
Manual of Style / Accessibility
Alternative text for images
Data tables tutorial
Template priorities
Most widely used templates
Top 200
200–1000
Watchlist
Infobox accessibility
Manual of Style draft
Methodology
Resources and references

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