Knowledge (XXG)

Tab key

Source ๐Ÿ“

332:, when developing computer programs or storing and manipulating data in files, the Tab character is often used for indentation purposes to help guide the flow of reading and add semantic structure to the code or data. Some programmers and programming languages prefer the usage of multiple whitespace characters instead for that purpose. Because of this, many text editors have an option that makes the tab key insert the number of whitespace characters that a tab character is set to be equivalent to (by default mostly four). 1421: 175: 133: 36: 299:, you may type the first few characters of a command or file-name, then press Tab. If there is no ambiguity about your intent, the rest of the characters will appear automatically. On some systems, even if your input is ambiguous, tab completion may give you a list of possible options to select from. Tab completion is more common on 222:
key to back up to the position of the first digit is practical but slow. Various schemes for numeric tabs were proposed. For example, in 1903, Harry Dukes and William Clayton filed for a patent on a tab mechanism with multiple tab keys numbered 1, 10, 100, etc. Pressing 1 was a simple tab. Pressing
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Despite the fact that five characters were the typical paragraph indentation on typewriters at that time, the horizontal tab size of eight evolved because as a power of two it was easier to calculate with the limited digital electronics available. Using this size tab to indent code results in much
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standardized at every multiple of eight characters horizontally, and every six lines vertically. A printing program could send zero or more tabs to get to the closest tab stop above and left of where it wanted to print, then send line feeds and spaces to get to the final location. Tab characters
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filed for a patent in 1904 covering a system where the tab stops were permanently mounted on the tab bar. To set or reset a tab for a particular column, the tab stop for that column was simply rotated in or out of engagement. In 1940, James Koca filed for a patent on a mechanism allowing the tab
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the first line of each paragraph. Often a first tab stop at 5 or 6 characters was used for this, far larger than the indentation used when typesetting. For numeric data, however, the logical place for the tab stop is the location of the least significant digit. Tabbing to this location and then
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includes the codes 136 (Horizontal Tabulation Set), 137 (Horizontal Tabulation with Justification) and 138 (Vertical Tabulation Set) that were intended to allow the program to set and clear tab stops. This is rarely used or supported.
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and formatted into a table with a single command. For example, in Microsoft Word 2010, Insert > Table > Convert Text to Table... is the necessary command, producing a dialog where the user selects further details.
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stops for each column to be set and cleared from the keyboard, eliminating the need for the typist to bend over the back of the machine to directly manipulate the tab rack. These keys, if present, are typically labeled
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to indicate the tab stops. These were manually set to match the pre-printed forms that were loaded into the printer. In practice, settable tab stops were rather quickly replaced with fixed tab stops,
437:, and whether to use tabs at all, are common. Modern text editors usually have the Tab key insert the user-defined indentation and may use heuristics to adapt this behavior to existing files. 325:, the Tab key is very often used to show scores in multiplayer games. For single player games it is also used to show the world map or the player's inventory, as well as other useful info. 210:. The original tabulator stops were adjustable clips that could be arranged by the user on the tabulator rack. Fredric Hillard filed a patent application for such a mechanism in 1900. 255:, the Tab key will move the insertion point to the next tab stop in a table, insert the ASCII tab character, or insert multiple space characters (depending on the program used). 416:
Originally, printer mechanisms used mechanical tab stops to indicate where the tabs went. This was done horizontally with movable metal prongs in a row, and vertically with a
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key. To simplify this, a horizontal bar was placed in the mechanism called the tabulator rack. Pressing the tab key would advance the carriage to the next
433:, allow the size of the tab to be changed, and some (in particular on Windows) default to four instead of eight. Disagreements between programmers about 590: This line begins with a single tab. Here are some more tab characters ! T.......T.......T.......T.......T.......T.......T.......T 576: This line begins with a single tab. Here are some more tab characters ! T.......T.......T.......T.......T.......T.......T.......T 455:(TSV) are used for exporting and importing database or spreadsheet field values. Text divided into fields delimited by tabs can often be pasted into a 1747: 943: 476:
TSV has also been cited in a modern approach to solving the programming debate regarding the use of tabs and spaces for code alignment called
1261: 1528: 1526: 1490: 1282: 430: 119: 262:(and Shift-Tab will move the cursor to the previous field), eliminating the need to use a mouse to click in an adjacent field. 194:, which means "to arrange data in a tabular, or table, form." When a person wanted to type a table (of numbers or text) on a 57: 1425: 1491: 1478: 1477: 2108: 1836: 1740: 1516: 1101: 100: 1464: 1463: 599:, the eight-character spacing, and how a tab stop is skipped if there are more than eight characters since last one. 606:
property, which adjusts the number of spaces for the tab character from the default of eight. The latest version of
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code points for the (horizontal) tab character, and the more rarely used vertical tab character are copied from
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Initially tab stops were set by adding and removing clips from the tab rack, but Edward Hess working for the
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10 advanced to the space before the tab, pressing 100 advanced to the position 2 spaces before the tab.
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but as with all whitespace characters in HTML, this will be displayed as a single space except inside
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such as buttons so that the user interface can be used without a mouse at all (this was part of the
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When filling out a computerized form, pressing Tab will sometimes move the cursor to the next
383:. The horizontal tab is usually inserted when the Tab key on a standard keyboard is pressed. 2082: 1430: 695: 477: 137: 2077: 1962: 1824: 1809: 1253: 373: 1424: 1152: 2025: 1994: 1867: 1373: 1138: 1005:
Harry S. Dukes and William H. Clayton, Tabulating mechanism for type-writing machines,
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Unicode also has characters for the symbols to represent or be printed on the tab key:
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Unicode provides additional characters for tab symbols with triangle-headed arrow:
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model 2201. On this machine, the tab-rack is removable for easy reconfiguration.
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The tab mechanism came into its own as a rapid and consistent way of uniformly
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can be used to complete a partially typed piece of text. For example, in some
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The TSV convention for exporting data may be compared to the alternative
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loop of mylar or other tape the length of a page with holes punched in it
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the code for HT is 5. VT is 11 (coincidentally the same as in ASCII).
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white space on the left, so most text editors for code, such as
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has the decimal character code of 9, and may be referred to as
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Notice that the tab at the start of a line is removed outside
198:, there was a lot of time-consuming and repetitive use of the 29: 562:! T.......T.......T.......T.......T.......T.......T.......T 1077:"Elastic tabstops - a better way to indent and align code" 390:(VT) also exists and has ASCII decimal character code 11 ( 1698: 1668: 1663: 1658: 1642: 1637: 1632: 1614: 1609: 1604: 1419: 676:(CHARACTER TABULATION, horizontal tabulation (HT), tab) 1102:
Character encodings in HTML#HTML character references
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The tab characters can be graphically represented by
1153:"CSS tab-size property on Mozilla Developer Network" 2039: 2008: 1950: 1909: 1876: 1860: 1782: 1764: 750:
LEFTWARDS ARROW TO BAR OVER RIGHTWARDS ARROW TO BAR
634: 627: 619: 611: 603: 517: 513: 497: 493: 403: 376: 288:, this is an option called "Full Keyboard Access". 60:. Unsourced material may be challenged and removed. 969:"Instructions for Using the Underwood Typewriter" 473:use tab-separated values to indicate selectors. 1423: 265:In many graphical applications, especially on 1741: 1276: 8: 1231:"Miscellaneous Symbols and Arrows โ€“ Unicode" 690:(LINE TABULATION, vertical tabulation (VT)) 1748: 1734: 1726: 1283: 1269: 1139:"CSS 3 tab-size property W3 specification" 1035:James F. Koca, Typewriter stop mechanism, 990:Fredric W. Hillard, Type-writing machine, 425:simply became a form of data compression. 162:is used to advance the cursor to the next 379:can be used to put this character into a 120:Learn how and when to remove this message 538:This line begins with a single tab. Here 395: 391: 357: 353: 147: 1248: 944:"Underwood Portable Typewriter Gallery" 935: 856:RIGHTWARDS TRIANGLE-HEADED ARROW TO BAR 1418: 1251: 1167:"Extensible Markup Language (XML) 1.0" 873:DOWNWARDS TRIANGLE-HEADED ARROW TO BAR 822:LEFTWARDS TRIANGLE-HEADED ARROW TO BAR 767:LEFTWARDS ARROW OVER RIGHTWARDS ARROW 7: 1173:. 26 November 2008. sec. "Charsets". 839:UPWARDS TRIANGLE-HEADED ARROW TO BAR 630:CSS property with the same meaning. 58:adding citations to reliable sources 596: 581: 568: 505: 501: 340:The most known and common tab is a 1114:"Character Entity Reference Chart" 492:the horizontal tab is coded using 25: 1020:Edward B. Hess, Writing Machine, 136:Tab key (top left) on a standard 713:SYMBOL FOR HORIZONTAL TABULATION 34: 27:Key on a keyboard for tabulation 45:needs additional citations for 729:SYMBOL FOR VERTICAL TABULATION 1: 1185:"C0 Controls and Basic Latin" 508:tags (or other elements with 269:, the Tab key will move the 2130: 1406: 435:what size tabs are correct 1696: 1672: 1618: 1560: 1543: 1414: 1410: 626:web browser supports the 618:web browser supports the 1041:, granted Sep. 19, 1944. 1026:, granted Aug. 17. 1909. 1011:, granted Dec. 29, 1908. 996:, granted Feb. 10, 1903. 533: 228:Royal Typewriter Company 800:RIGHTWARDS ARROW TO BAR 297:command-line interfaces 1540: 919:Comma-separated values 783:LEFTWARDS ARROW TO BAR 637:but is not allowed in 593: 465:comma-separated values 282:IBM Common User Access 190:derives from the word 183: 140: 2047:Power management keys 1539: 1038:U.S. patent 2,358,517 525: 370:programming languages 342:horizontal tabulation 177: 135: 18:Horizontal tabulation 2049:(Power, Sleep, Wake) 1052:"Tabs versus Spaces" 753:(tab with shift tab) 687:<control-000B> 673:<control-0009> 633:The vertical tab is 523:Here is an example: 453:Tab-separated values 448:Tab-separated values 402:), escape character 346:character tabulation 330:software engineering 178:The tab rack from a 54:improve this article 2068:Keyboard technology 1155:. 21 February 2023. 1023:U.S. patent 931,305 1008:U.S. patent 908,221 993:U.S. patent 720,520 388:vertical tabulation 2109:Control characters 1541: 1208:"Arrows โ€“ Unicode" 890:HORIZONTAL TAB KEY 622:CSS property, the 184: 141: 2091: 2090: 2073:Keyboard shortcut 1922:Page Up/Page Down 1724: 1723: 1719: 1706: 1676: 1568: 1081:nickgravgaard.com 1075:Gravgaard, Nick. 925:Indentation style 291:A feature called 278:control or widget 150:(abbreviation of 130: 129: 122: 104: 16:(Redirected from 2121: 2083:Keyboard mapping 1750: 1743: 1736: 1727: 1717: 1704: 1674: 1564: 1422: 1285: 1278: 1271: 1249: 1244: 1243: 1241: 1240: 1235: 1227: 1221: 1220: 1218: 1217: 1212: 1204: 1198: 1197: 1195: 1194: 1189: 1181: 1175: 1174: 1169:(5th ed.). 1163: 1157: 1156: 1149: 1143: 1142: 1135: 1129: 1128: 1126: 1124: 1110: 1104: 1098: 1092: 1091: 1089: 1087: 1072: 1066: 1065: 1063: 1062: 1048: 1042: 1040: 1033: 1027: 1025: 1018: 1012: 1010: 1003: 997: 995: 988: 982: 981: 979: 978: 973: 965: 959: 958: 956: 955: 946:. Archived from 940: 907: 906:VERTICAL TAB KEY 904: 901: 899: 891: 888: 885: 883: 874: 871: 868: 866: 857: 854: 851: 849: 840: 837: 834: 832: 823: 820: 817: 815: 801: 798: 795: 793: 784: 781: 778: 776: 768: 765: 762: 760: 751: 748: 745: 743: 730: 727: 724: 722: 714: 711: 708: 706: 688: 685: 683: 674: 671: 669: 641:; this includes 636: 629: 621: 613: 605: 598: 583: 570: 561: 557: 553: 549: 545: 541: 537: 519: 515: 507: 503: 499: 495: 478:elastic tabstops 405: 401: 378: 363: 138:Windows keyboard 125: 118: 114: 111: 105: 103: 62: 38: 30: 21: 2129: 2128: 2124: 2123: 2122: 2120: 2119: 2118: 2094: 2093: 2092: 2087: 2078:Keyboard layout 2035: 2004: 1963:Carriage return 1946: 1910:Navigation keys 1905: 1872: 1856: 1778: 1760: 1754: 1715: 1701: 1566: 1538: 1420: 1389: 1380: 1372: 1290: 1289: 1254:IBM PC keyboard 1247: 1238: 1236: 1233: 1229: 1228: 1224: 1215: 1213: 1210: 1206: 1205: 1201: 1192: 1190: 1187: 1183: 1182: 1178: 1165: 1164: 1160: 1151: 1150: 1146: 1137: 1136: 1132: 1122: 1120: 1112: 1111: 1107: 1099: 1095: 1085: 1083: 1074: 1073: 1069: 1060: 1058: 1050: 1049: 1045: 1036: 1034: 1030: 1021: 1019: 1015: 1006: 1004: 1000: 991: 989: 985: 976: 974: 971: 967: 966: 962: 953: 951: 942: 941: 937: 933: 915: 908: 905: 902: 897: 896: 892: 889: 886: 881: 880: 875: 872: 869: 864: 863: 858: 855: 852: 847: 846: 841: 838: 835: 830: 829: 824: 821: 818: 813: 812: 803:(rightward tab) 802: 799: 796: 791: 790: 785: 782: 779: 774: 773: 769: 766: 763: 758: 757: 752: 749: 746: 741: 740: 731: 728: 725: 720: 719: 715: 712: 709: 704: 703: 696:special symbols 689: 686: 681: 680: 675: 672: 667: 666: 651: 592: 577: 564: 563: 559: 555: 551: 547: 543: 539: 535: 486: 450: 399: 397: 393: 374:escape sequence 368:and many other 361: 359: 355: 338: 249:word processing 245: 172: 149: 126: 115: 109: 106: 63: 61: 51: 39: 28: 23: 22: 15: 12: 11: 5: 2127: 2125: 2117: 2116: 2111: 2106: 2096: 2095: 2089: 2088: 2086: 2085: 2080: 2075: 2070: 2065: 2060: 2055: 2050: 2043: 2041: 2037: 2036: 2034: 2033: 2028: 2026:System request 2023: 2018: 2012: 2010: 2006: 2005: 2003: 2002: 2000:Language input 1997: 1995:Numeric keypad 1992: 1987: 1982: 1977: 1972: 1967: 1966: 1965: 1954: 1952: 1948: 1947: 1945: 1944: 1939: 1934: 1929: 1924: 1919: 1913: 1911: 1907: 1906: 1904: 1903: 1898: 1893: 1888: 1882: 1880: 1874: 1873: 1871: 1870: 1864: 1862: 1858: 1857: 1855: 1854: 1849: 1844: 1839: 1818: 1813: 1799: 1794: 1788: 1786: 1780: 1779: 1777: 1776: 1770: 1768: 1762: 1761: 1755: 1753: 1752: 1745: 1738: 1730: 1722: 1721: 1708: 1695: 1690: 1685: 1679: 1678: 1671: 1666: 1661: 1656: 1654: 1649: 1646: 1645: 1640: 1635: 1630: 1628: 1626: 1623: 1622: 1617: 1612: 1607: 1602: 1597: 1592: 1586: 1585: 1580: 1575: 1570: 1561: 1559: 1554: 1549: 1544: 1542: 1416: 1415: 1413: 1411: 1409: 1407: 1404: 1403: 1401: 1399: 1397: 1395: 1393: 1383: 1376: 1366: 1364: 1359: 1354: 1349: 1344: 1342: 1337: 1332: 1327: 1322: 1320: 1315: 1310: 1305: 1300: 1298: 1292: 1291: 1288: 1287: 1280: 1273: 1265: 1252: 1246: 1245: 1222: 1199: 1176: 1158: 1144: 1130: 1105: 1093: 1067: 1043: 1028: 1013: 998: 983: 960: 934: 932: 929: 928: 927: 922: 914: 911: 910: 909: 895: 893: 879: 877: 862: 860: 845: 843: 828: 826: 811: 805: 804: 789: 787: 786:(leftward tab) 772: 770: 756: 754: 739: 733: 732: 718: 716: 702: 692: 691: 679: 677: 665: 650: 647: 645:1.0 and HTML. 614:property. The 588: 587: 586: 584: 575: 574: 573: 571: 534: 532: 531: 529: 485: 482: 457:word processor 449: 446: 381:string literal 337: 336:Tab characters 334: 293:tab completion 244: 241: 208:tabulator stop 171: 168: 128: 127: 42: 40: 33: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2126: 2115: 2112: 2110: 2107: 2105: 2104:Computer keys 2102: 2101: 2099: 2084: 2081: 2079: 2076: 2074: 2071: 2069: 2066: 2064: 2061: 2059: 2056: 2054: 2051: 2048: 2045: 2044: 2042: 2038: 2032: 2029: 2027: 2024: 2022: 2019: 2017: 2016:Function keys 2014: 2013: 2011: 2007: 2001: 1998: 1996: 1993: 1991: 1988: 1986: 1983: 1981: 1978: 1976: 1973: 1971: 1968: 1964: 1961: 1960: 1959: 1956: 1955: 1953: 1949: 1943: 1940: 1938: 1935: 1933: 1930: 1928: 1925: 1923: 1920: 1918: 1915: 1914: 1912: 1908: 1902: 1899: 1897: 1894: 1892: 1889: 1887: 1884: 1883: 1881: 1879: 1875: 1869: 1866: 1865: 1863: 1859: 1853: 1850: 1848: 1845: 1843: 1840: 1838: 1834: 1830: 1826: 1822: 1819: 1817: 1814: 1811: 1807: 1803: 1800: 1798: 1795: 1793: 1790: 1789: 1787: 1785: 1784:Modifier keys 1781: 1775: 1772: 1771: 1769: 1767: 1763: 1758: 1751: 1746: 1744: 1739: 1737: 1732: 1731: 1728: 1720: 1713: 1709: 1707: 1702:    1700: 1697:    1694: 1691: 1689: 1686: 1684: 1681: 1680: 1677: 1670: 1667: 1665: 1662: 1660: 1657: 1655: 1653: 1650: 1648: 1647: 1644: 1641: 1639: 1636: 1634: 1631: 1629: 1627: 1625: 1624: 1621: 1616: 1613: 1611: 1608: 1606: 1603: 1601: 1598: 1596: 1593: 1591: 1588: 1587: 1584: 1581: 1579: 1576: 1574: 1571: 1569: 1562: 1558: 1555: 1553: 1550: 1548: 1545: 1417: 1412: 1408: 1405: 1402: 1400: 1398: 1396: 1394: 1392: 1387: 1384: 1382: 1377: 1375: 1370: 1367: 1365: 1363: 1360: 1358: 1355: 1353: 1350: 1348: 1345: 1343: 1341: 1338: 1336: 1333: 1331: 1328: 1326: 1323: 1321: 1319: 1316: 1314: 1311: 1309: 1306: 1304: 1301: 1299: 1297: 1294: 1293: 1286: 1281: 1279: 1274: 1272: 1267: 1266: 1263: 1259: 1255: 1250: 1232: 1226: 1223: 1209: 1203: 1200: 1186: 1180: 1177: 1172: 1168: 1162: 1159: 1154: 1148: 1145: 1140: 1134: 1131: 1119: 1115: 1109: 1106: 1103: 1097: 1094: 1082: 1078: 1071: 1068: 1057: 1053: 1047: 1044: 1039: 1032: 1029: 1024: 1017: 1014: 1009: 1002: 999: 994: 987: 984: 970: 964: 961: 950:on 2011-02-22 949: 945: 939: 936: 930: 926: 923: 920: 917: 916: 912: 894: 878: 861: 844: 827: 810: 809: 808: 788: 771: 755: 738: 737: 736: 717: 701: 700: 699: 697: 678: 664: 663: 662: 660: 656: 648: 646: 644: 640: 631: 628:-moz-tab-size 625: 617: 610:supports the 609: 602:CSS3 defines 600: 591: 585: 579: 578: 572: 566: 565: 530: 527: 526: 524: 521: 511: 491: 483: 481: 479: 474: 472: 468: 466: 461: 458: 454: 447: 445: 442: 438: 436: 432: 426: 423: 419: 414: 412: 407: 389: 384: 382: 375: 371: 367: 351: 347: 343: 335: 333: 331: 326: 324: 321: 316: 314: 311:systems than 310: 306: 302: 298: 294: 289: 287: 283: 279: 276: 272: 268: 263: 261: 256: 254: 250: 242: 240: 238: 234: 229: 224: 221: 218:pressing the 216: 211: 209: 205: 201: 197: 193: 189: 181: 176: 169: 167: 165: 161: 157: 153: 152:tabulator key 146: 139: 134: 124: 121: 113: 110:February 2023 102: 99: 95: 92: 88: 85: 81: 78: 74: 71: โ€“  70: 66: 65:Find sources: 59: 55: 49: 48: 43:This article 41: 37: 32: 31: 19: 2021:Print Screen 1984: 1958:Enter/Return 1237:. 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Index

Horizontal tabulation

verification
improve this article
adding citations to reliable sources
"Tab key"
news
newspapers
books
scholar
JSTOR
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Windows keyboard
keyboard
tab stop

Flexowriter
typewriter
space bar
backspace
tabulator stop
indenting
backspace
Royal Typewriter Company
word processing
text editing
field
Windows
focus

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