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ちいさな Web ブラウザを作ってみよう(オンライン講義版) / Build Your Own...
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Takashi Yoneuchi
August 11, 2021
Programming
18
11k
ちいさな Web ブラウザを作ってみよう(オンライン講義版) / Build Your Own Web Browser
本資料はセキュリティ・キャンプ全国大会 2021 B1 の講義で利用したものです。お問合せは
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宛によろしくお願いします。
Takashi Yoneuchi
August 11, 2021
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Transcript
͍ͪ͞ͳ8FCϒϥβΛ࡞ͬͯΈΑ͏ ηΩϡϦςΟɾΩϟϯϓશࠃେձ #τϥοΫ :0/&6$)* 5BLBTIJ IUUQTTIJGUKTJOGP
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 2 ຊߨٛࢿྉʹ͍ͭͯ 4QFBLFS%FDLެ։൛͚ͷิ w ຊࢿྉʮηΩϡϦςΟɾΩϟϯϓશࠃେձΦϯϥΠϯ#ʯͷߨٛʹར༻ ͞ΕͨࢿྉΛ࠶ฤͨ͠ͷͰ͢ɻ
w ࣮ࡍʹ8FCϒϥβΛ࡞ΔͨΊͷઆ໌ɺ͜ͷࢿྉʹͳ͘ɺࣄલ՝ࢿྉͱͯ͠ ެ։ͨ͠ΦϯϥΠϯϒοΫIUUQTCSPXTFSCPPLTIJGUKTJOGPʹ͋Γ·͢ɻ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ XIPBNJ ৄࡉIUUQTTIJGUKTJOGPʹ͋Γ·͢ 3 ‣ ถوࢤ :0/&6$)*
5BLBTIJ ‣ ηΩϡϦςΟɾΩϟϯϓதԝେձଔۀੜ ‣ ͜ΕΛػʹηΩϡϦςΟΛࢤ͢Α͏ʹ ‣ גࣜձࣾ'MBUU4FDVSJUZࣥߦһ$50 ‣ ʮ։ൃऀͷͨΊͷɺ։ൃऀʹدΓఴͬͨη ΩϡϦςΟʯΛୈҰٛͱͯ͠ಇ͍͍ͯ·͢ ‣ ੈͷதͷʢಛʹΠϯϋεͷʣϓϩμΫτ νʔϜ͕҆৺ͯ͠ಇ͚ΔੈքΛ࡞Γ͍ͨͰ͢ ‣ ஶॻͳͲ ‣ ʰ8FCϒϥβηΩϡϦςΟʱ ‣ ʰৄղηΩϡϦςΟίϯςετʱ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ ߨٛͷత #͍ͪ͞ͳ8FCϒϥβΛͭͬͯ͘ΈΑ͏ ‣ ࣄલ՝ͷత8FCϒϥβΛ࡞Γͳ͕ΒҎԼΛಘΔ͜ͱͰͨ͠ ‣
طଘͷ8FCϒϥβ࣮ΛಡΉ࣌ͷख͕͔Γ ‣ େྔͷ8FCඪ४จॻʹΛ௨͚ͩ͢ͰಘΒΕͳ͍ಎ IUUQTCSPXTFSCPPLTIJGUKTJOGP
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ ߨٛͷత #͍ͪ͞ͳ8FCϒϥβΛͭͬͯ͘ΈΑ͏ ‣ ࠓͷ)ߨٛͷత࡞ΔͨΊͷجૅྗΛ͑Δ͜ͱɻΑΓ۩ମతʹʜ ‣
8FCඪ४طଘͷ8FCϒϥβ࣮ΛಡΉྗɾۛຯ͢Δྗɾݕূ͢ΔྗΛ͑Δ͜ͱɻ ‣ 8FCΫϥΠΞϯταΠυηΩϡϦςΟͷجૅ֓೦Λܰͬͯ͘Β͏͜ͱɻ ‣ ࠓޙʢ8FCϒϥβҎ֎ؚΊʣ༷ʑͳϓϩμΫτΛௐࠪɾֶशɾ։ൃ͍ͯͨ͘͠Ίͷ ͞ΒͳΔֶशΛਐΊ͍ͯͨ͘ΊͷΛ࡞Δ͜ͱɻ Ͳ͏͍͏എܠͷΈͩΖ͏ʁ ଥͳΈ͔ͳʁ ϒϥβ࣮ඪ४௨Γ͔ͳʁ 🧐
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 6 ‣ 1BSUࣄલֶशͷৼΓฦΓ ‣ ࣄલֶशͰऔΓѻ߲ͬͨΛͬ͟ͱ࠶આ໌͠·͢ɻ ‣
1BSUޚऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 'FUDI4UBOEBSEΛࡐʹɺ8FCඪ४ΛಡΈղ͖ͳ͕Βɺݱ8FCʹ͓͚ΔηΩϡϦ ςΟʹ͍ͭͯͷߟ͑ํΛ༷͔Βཧղ͢Δɾݕূ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU߈ܸऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ ຊߨٛͰ࡞ͬͨϒϥβͷϦϑΝϨϯε࣮ͷ8FCඪ४ʹै͍ͬͯͳ͍ՕॴΛࡐ ʹɺ8FCϒϥβͷڍಈ8FCඪ४Λۛຯ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU͞Βʹ͘ɾਂ͘ߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 8FCϒϥβͷΠϯλʔϑΣΠεʹؔ࿈͢Δɺ8FCϒϥβͷ͞Βʹৄࡉͳ ෦ߏʹґڌ͢Δʹ͍ͭͯɺ࣮ࡍͷػೳͷݕূΛަ͑ͳ͕Β֓؍Λ͓͑͠·͢ɻ ࠓͷߨٛຊཱͯͰ͢
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 7 ‣ 1BSUࣄલֶशͷৼΓฦΓ ‣ ࣄલֶशͰऔΓѻ߲ͬͨΛͬ͟ͱ࠶આ໌͠·͢ɻ ‣
1BSUޚऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 'FUDI4UBOEBSEΛࡐʹɺ8FCඪ४ΛಡΈղ͖ͳ͕Βɺݱ8FCʹ͓͚ΔηΩϡϦ ςΟʹ͍ͭͯͷߟ͑ํΛ༷͔Βཧղ͢Δɾݕূ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU߈ܸऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ ຊߨٛͰ࡞ͬͨϒϥβͷϦϑΝϨϯε࣮ͷ8FCඪ४ʹै͍ͬͯͳ͍ՕॴΛࡐ ʹɺ8FCϒϥβͷڍಈ8FCඪ४Λۛຯ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU͞Βʹ͘ɾਂ͘ߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 8FCϒϥβͷΠϯλʔϑΣΠεʹؔ࿈͢Δɺ8FCϒϥβͷ͞Βʹৄࡉͳ ෦ߏʹґڌ͢Δʹ͍ͭͯɺ࣮ࡍͷػೳͷݕূΛަ͑ͳ͕Β֓؍Λ͓͑͠·͢ɻ ࠓͷߨٛຊཱͯͰ͢
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 8 ‣ 1BSUࣄલֶशͷৼΓฦΓ ‣ ࣄલֶशͰऔΓѻ߲ͬͨΛͬ͟ͱ࠶આ໌͠·͢ɻ ‣
1BSUޚऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 'FUDI4UBOEBSEΛࡐʹɺ8FCඪ४ΛಡΈղ͖ͳ͕Βɺݱ8FCʹ͓͚ΔηΩϡϦ ςΟʹ͍ͭͯͷߟ͑ํΛ༷͔Βཧղ͢Δɾݕূ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU߈ܸऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ ຊߨٛͰ࡞ͬͨϒϥβͷϦϑΝϨϯε࣮ͷ8FCඪ४ʹै͍ͬͯͳ͍ՕॴΛࡐ ʹɺ8FCϒϥβͷڍಈ8FCඪ४Λۛຯ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU͞Βʹ͘ɾਂ͘ߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 8FCϒϥβͷΠϯλʔϑΣΠεʹؔ࿈͢Δɺ8FCϒϥβͷ͞Βʹৄࡉͳ ෦ߏʹґڌ͢Δʹ͍ͭͯɺ࣮ࡍͷػೳͷݕূΛަ͑ͳ͕Β֓؍Λ͓͑͠·͢ɻ ࠓͷߨٛຊཱͯͰ͢
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 9 ‣ 1BSUࣄલֶशͷৼΓฦΓ ‣ ࣄલֶशͰऔΓѻ߲ͬͨΛͬ͟ͱ࠶આ໌͠·͢ɻ ‣
1BSUޚऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 'FUDI4UBOEBSEΛࡐʹɺ8FCඪ४ΛಡΈղ͖ͳ͕Βɺݱ8FCʹ͓͚ΔηΩϡϦ ςΟʹ͍ͭͯͷߟ͑ํΛ༷͔Βཧղ͢Δɾݕূ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU߈ܸऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ ຊߨٛͰ࡞ͬͨϒϥβͷϦϑΝϨϯε࣮ͷ8FCඪ४ʹै͍ͬͯͳ͍ՕॴΛࡐ ʹɺ8FCϒϥβͷڍಈ8FCඪ४Λۛຯ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU͞Βʹ͘ɾਂ͘ߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 8FCϒϥβͷΠϯλʔϑΣΠεʹؔ࿈͢Δɺ8FCϒϥβͷ͞Βʹৄࡉͳ ෦ߏʹґڌ͢Δʹ͍ͭͯɺ࣮ࡍͷػೳͷݕূΛަ͑ͳ͕Β֓؍Λ͓͑͠·͢ɻ ࠓͷߨٛຊཱͯͰ͢
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 10 ‣ 1BSUࣄલֶशͷৼΓฦΓ ‣ ࣄલֶशͰऔΓѻ߲ͬͨΛͬ͟ͱ࠶આ໌͠·͢ɻ ‣
1BSUޚऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 'FUDI4UBOEBSEΛࡐʹɺ8FCඪ४ΛಡΈղ͖ͳ͕Βɺݱ8FCʹ͓͚ΔηΩϡϦ ςΟʹ͍ͭͯͷߟ͑ํΛ༷͔Βཧղ͢Δɾݕূ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU߈ܸऀࢹͰߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ ຊߨٛͰ࡞ͬͨϒϥβͷϦϑΝϨϯε࣮ͷ8FCඪ४ʹै͍ͬͯͳ͍ՕॴΛࡐ ʹɺ8FCϒϥβͷڍಈ8FCඪ४Λۛຯ͢ΔԋशʹऔΓΜͰ͍͖ͨͩ·͢ɻ ‣ 1BSU͞Βʹ͘ɾਂ͘ߟ͑Δ8FCϒϥβͷηΩϡϦςΟ ‣ 8FCϒϥβͷΠϯλʔϑΣΠεʹؔ࿈͢Δɺ8FCϒϥβͷ͞Βʹৄࡉͳ ෦ߏʹґڌ͢Δʹ͍ͭͯ֓؍Λ͓͑͠·͢ɻ ࠓͷߨٛຊཱͯͰ͢
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 11 ‣ ͠Α͚Ε5XJUUFS(PPHMF.FFUͷνϟοτͰΨϠΨϠ͍ͯͩ͘͠͞ ‣ ࣭4MBDL.FFUͷ྆ํͰԕྀͳ͘Ͳ͏ͧʂ ߨࢣ͔Βͷ͓ئ͍ࣄ
ࣄલֶशͷৼΓฦΓ 1BSU
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ ࣄલ՝ IUUQTCSPXTFSCPPLTIJGUKTJOGP
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 14 ‣ ϨϯμϦϯάΤϯδϯؔ࿈ͷجૅ֓೦ ‣ )5.-ɾ%0.ؔ࿈ ‣
$44ɾ$440.ؔ࿈ ‣ ϨϯμϦϯάπϦʔؔ࿈ ‣ #PY5SFFͱϨΠΞτɾϖΠϯτؔ࿈ ‣ +BWB4DSJQUΤϯδϯʢͱ͘ʹ7ʣؔ࿈ ‣ ؆қ%0."1*ؔ࿈ ‣ 8FCඪ४ϓϥοτϑΥʔϜपลͷجૅ֓೦ ‣ 8FCඪ४ؔ࿈ͷஂମʢ8$ 8)"58( ʣ ‣ 8FC*%- ‣ 8FC1MBUGPSN5FTUT ࣄલֶशࢿྉͷৼΓฦΓ )5.-ɾ$44 %0. $440. ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ϖΠϯτ݁Ռ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ +BWB4DSJQU ʹΑΔ࡞༻ )551ʹΑΔ )5.-ɾ$44ͷऔಘ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 15 ‣ Ծఆ)551Λ௨ͯ͠औಘ͖ͯͨ͠ 8FCϖʔδΛ͜Ε͔Βඳը͢Δͱ͢Δ ‣ ఔ)5.-Λύʔεͯ͠%0.ͷΑ͏
ͳߏʹม͢Δ ‣ ՝ҎԼΛ࢝Ίͱͨ͠ಠಛͳ༷܈ ‣ ࣈ۟ղੳߏจղੳͷϓϩηε͕༰Ͱ͋Δ ‣ શͳ%0.ͷߏஙʹɺߏங࠷தͷ +BWB4DSJQUͷಉظత࣮ߦ͕ඞཁ ‣ ࣮ࣄલ՝ࢿྉͰ)5.- 4UBOEBSE͕ఆٛ͢Δݴޠͷαϒηοτ Ͱ͋Δখ͞ͳจ຺ࣗ༝ݴޠΛߟ͑ͨ )5.-ΛऔΓѻ͏ ࣄલֶशࢿྉͷৼΓฦΓ )5.-ɾ$44 %0. $440. ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ +4ىҼͷ ࠶ೖ +4ىҼͷ มߋ ϖΠϯτ݁Ռ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 16 ݱࡏ8)"58(ʹΑΓ-JWJOH4UBOEBSEͱͯ͠ϝϯςφϯε͞Ε͍ͯΔ )5.-ʹؔ͢Δ8FCඪ४
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 17 $44ΛऔΓѻ͏ ࣄલֶशࢿྉͷৼΓฦΓ )5.-ɾ$44 %0. $440.
ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ +BWB4DSJQU ʹΑΔ࡞༻ ‣ Ծఆ)551Λ௨ͯ͠औಘ͖ͯͨ͠ 8FCϖʔδΛ͜Ε͔Βඳը͢Δͱ͢Δ ‣ ఔ$44Λύʔεͯ͠$440.ʢͦ Εʹྨ͢Δσʔλߏʣʹม͢Δ ‣ )5.-ಉ༷ʹ!JNQPSUͳͲ͕$440. ߏஙΛϒϩοΫ͠͏Δ͕ɺ)5.-ͷऔΓ ѻ͍΄ͲෳࡶͳͷͰͳ͍ ‣ $440.$BTDBEJOH%FGBVMUJOHʹ උ͑ͯπϦʔߏΛऔ͍ͬͯΔ߹͋Δ ‣ ࣮ࣄલ՝ࢿྉͰ$444ZOUBY .PEVMF-FWFMΛத৺ͱͨ͠ඪ४͕ఆ ٛ͢ΔݴޠͷαϒηοτΛߟ͑ͨ ϖΠϯτ݁Ռ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 18 ݱࡏ8$ʹΑΓෳͷϞδϡʔϧʹׂ͞Εͯϝϯςφϯε͞Ε͍ͯΔ $44ʹؔ͢Δ8FCඪ४
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 19 ϨϯμϦϯάͷલ४උ ࣄલֶशࢿྉͷৼΓฦΓ )5.-ɾ$44 %0. $440.
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© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 21 ϖΠϯτ ࣄલֶशࢿྉͷৼΓฦΓ )5.-ɾ$44 %0. $440.
ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ϖΠϯτ݁Ռ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ +BWB4DSJQU ʹΑΔ࡞༻ ‣ Ծఆ)551Λ௨ͯ͠औಘ͖ͯͨ͠ 8FCϖʔδΛ͜Ε͔Βඳը͢Δͱ͢Δ ‣ ఔϨΠΞτ݁ՌΛɺͦΕΛ࣮ը໘ʹ ඳը͢ΔͨΊͷԿΒ͔ͷදݱʹม͢Δ ‣ ϒϥβ࣮ʹΑͬͯ͜ͷදݱҟͳΔ ͕ɺ͓Αͦʮ࠲ඪGPPʹCBSΛඳ͘ʯͷΑ ͏ͳݪ࢝తͳදݱΛΠϝʔδ͢ΔͱΑ͍ ‣ ͜ͷ݁ՌෳͷϨΠϠʹղ͞ΕͨΓɺ ٯʹ࣮ࡍͷඳը࣌ʹෳͷϨΠϠͱ߹ ͞ΕͨΓɺͱ͍ͬͨॲཧΛड͚ͳ͕Β࣮ը ໘ʹྲྀΕ͍ͯ͘ ‣ ࣮طଘ56*ϥΠϒϥϦʢ$VSTJWFʣ ʹڧ͘ґଘͨ͠؆қతͳ࣮Λͨ͠
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ޚऀࢹͰߟ͑Δ 8FCϒϥβͷηΩϡϦςΟ 1BSU
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 25 8FCඪ४ͱηΩϡϦςΟϞσϧ ˞ྫ֎ͱͯ͠ʢ4BGBSJͷ*51ͷΑ͏ͳʣϓϥΠόγʔपΓͷϞσϧɺ8FCϒϥβͷΞʔΩςΫνϟʹڧؔ͘͢ΔηΩϡϦςΟϞσϧɺʢ8&$(ͳͲ͕ಈ͖ͦ͏͕ͩʣϒϥβ֦ுػ ೳ·ΘΓͷηΩϡϦςΟϞσϧͳͲ8FCඪ४֎ʹ͋Γ͕ͪͳҹɻ ݱ8FCͷجૅͱͳ͍ͬͯΔηΩϡϦςΟϞσϧݒ೦ࣄ߲ 8FCඪ४ϨϕϧͰهड़ɾٞ͞Ε͍ͯΔ
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© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 26 ͜ͷ1BSUͷ֓ཁ ‣ औΓΉ͜ͱ ‣ 'FUDI4UBOEBSEʢͷಛʹηΩϡϦςΟʹ
ؔ࿈͢Δ߲ʣΛಡΈղ͘ ‣ طଘͷ8FCϒϥβ࣮ͷ'FUDIपล ͷڍಈ͕ඪ४ʹै͏͔Λݕূͯ͠ΈΔ ‣ 8FCඪ४ʢಛʹ8*$(ͱ8$ܥʣͷ ηΩϡϦςΟʹؔ͢ΔٞΛோΊͯΈΔ ‣ औΓΈͷඪ ‣ 8FCʹԣͨΘΔجૅతͳηΩϡϦςΟϞσϧ ʹ͍ͭͯͷཧղΛਂΊΔ ‣ 8FCඪ४͔ΒͦͷΑ͏ͳΈͷৄࡉΛಡΈ औΔɾཧղ͢ΔྗΛڧԽ͢Δ
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͍ͯ)551௨৴͕ൃੜ͢Δ ‣ )5.-4UBOEBSEͰ͍͏#SPXTJOH $POUFYUͷOBWJHBUJPOʹ֘ ‣ IUUQTIUNMTQFDXIBUXHPSH NVMUJQBHFCSPXTJOHUIF XFCIUNMOBWJHBUF 'FUDIͷྫ )5.-ɾ$44 %0. $440. ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ϖΠϯτ݁Ռʢը૾ʣ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ 6*ɾϒϥβΤϯδϯ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 29 ‣ %0.ߏஙதʹ+BWB4DSJQUϑΝΠϧ ͕ผ63-͔Βऔಘ͞ΕΔ߹͕͋Δ ‣ )5.-4UBOEBSEͰͷఆٛ
‣ UFYUJOTFSUJPONPEFͰͷTDSJQUFOE UBHൃݟ࣌ͷڍಈ IUUQTIUNMTQFDXIBUXHPSHNVMUJQBHF QBSTJOHIUNMQBSTJOHNBJOJODEBUB ‣ QSFQBSFBTDSJQU IUUQTIUNMTQFDXIBUXHPSHNVMUJQBHF TDSJQUJOHIUNMQSFQBSFBTDSJQU 'FUDIͷྫ )5.-ɾ$44 %0. $440. ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ϖΠϯτ݁Ռʢը૾ʣ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ 6*ɾϒϥβΤϯδϯ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 30 ‣ $440.ߏஙͷͨΊʹ$44ϑΝΠϧ͕ ผ63-͔Βऔಘ͞ΕΔ߹͋Δ ‣ ؔ࿈͢Δ8FCඪ४
‣ )5.-4UBOEBSEͷMJOLλάͷڍಈ ʹؔ͢Δఆٛ IUUQTIUNMTQFDXIBUXHPSHNVMUJQBHF TFNBOUJDTIUNMDPODFQUMJOLPCUBJO ‣ $440.पลͰͷఆٛ IUUQTESBGUTDTTXHPSHDTTPNGFUDIJOHDTT TUZMFTIFFUT 'FUDIͷྫ )5.-ɾ$44 %0. $440. ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ϖΠϯτ݁Ռʢը૾ʣ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ 6*ɾϒϥβΤϯδϯ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 31 ‣ JNHλάͳͲͷϝσΟΞܥλάϦ ΫΤετΛਵ࣌ൃߦ͠͏Δ ‣ )5.-4UBOEBSEͷؔ࿈Օॴ
IUUQTIUNMTQFDXIBUXHPSHNVMUJQBHF JNBHFTIUNMXIFOUPPCUBJOJNBHFT ‣ ҰൠʹαϒϦιʔεΛຒΊࠐΉܥͷλ άϦΫΤετΛਵ࣌ൃߦ͠͏Δ ‣ +BWB4DSJQU͔Β9.-)UUQ3FRVFTU GFUDI ʹΑΓϦΫΤετ͕ൃߦ͞ ΕΔ߹͕͋Δ 'FUDIͷྫ λΠϛϯά ࣮ʹΑΔ )5.-ɾ$44 %0. $440. ϨϯμϦϯάπϦʔ ϨΠΞτ݁Ռ ϖΠϯτ݁Ռʢը૾ʣ ελΠϦϯά ࣈ۟ղੳɾߏจղੳͳͲ ϨΠΞτ ϖΠϯτ 6*ɾϒϥβΤϯδϯ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 32 ‣ 8FCϒϥβ༷ʑͳ໘Ͱ)551௨৴ ʢͦͷଞͷ௨৴ʣΛߦ͏ ‣ ͜ΕΒͷ௨৴ʹଟ͘ͷݒ೦ࣄ߲͕͋Δ
‣ ϦιʔεͷִΛͲ͏ߦ͏ʁ ‣ ϦιʔεͷΩϟογϡΛͲ͏ߦ͏ʁ ‣ Ͳ͏͍͏ϦΫΤετͷൃߦΛՄೳʹ͢Δʁ ‣ ϨεϙϯεΛड͚औͬͨΒͲ͏͢Δʁ ‣ ΤϥʔϋϯυϦϯάʁϦμΠϨΫτʁ ‣ ʜʜ ‣ ͜ͷΑ͏ͳݒ೦ʹରͯ͠ըҰతʹ͑Δͨ Ίͷඪ४͕'FUDI4UBOEBSE ඪ४Խͷಈػ
IUUQTCSPXTFSCPPLTIJGUKTJOGPFWFOUTTFDDBNQQBSU ԋश͞·͟·ͳ'FUDI 'FUDIͱ͍͏ϓϩηε͕8FCϒϥβͷ༷ʑͳػೳʹ ؔ࿈͍ͯ͠Δ͜ͱΛ࣮ײ͠·͠ΐ͏ɻ
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IUUQTCSPXTFSCPPLTIJGUKTJOGPFWFOUTTFDDBNQQBSU ԋश'FUDI4UBOEBSEͱηΩϡϦςΟ 'FUDI4UBOEBSEΛਫ਼ಡͯ͠ɺͦ͜ʹηΩϡϦςΟʹؔ͢Δߟྀࣄ߲ɺ ηΩϡϦςΟʹؔ͢ΔΈ͕ଘࡏ͍ͯ͠Δ͜ͱΛ֬ೝ͠·͠ΐ͏ɻ
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© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 37 ԋशͷ;Γ͔͑Γ IUUQTGFUDITQFDXIBUXHPSHDPODFQUSFRVFTUBEESBOHFIFBEFS IUUQTGFUDITQFDXIBUXHPSHDPOUFOUUZQFIFBEFS ࡉ͔͍߲ʹҙࣄ߲͕ଟʑॻ͔Ε͍ͯΔͷ͕֬ೝͰ͖Δ
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 38 4BNF0SJHJO1PMJDZʢ401ʣ ԋशͰ֞ؒݟ͑ͨ'FUDIͷݒ೦ࣄ߲ͷྫ ‣ ʮIUUQTFWJMFYBNQMFDPN͕JGSBNFͰຒΊࠐΜͩIUUQTNBJMHPPHMFDPN ͷதΛ%0.ૢ࡞Λܦ༝ͯ͠౪Έग़͢ʯͱ͍͏͜ͱͰ͖ͳ͍͖
‣ 8FCϒϥβ֓ͯ͠0SJHJOʢ63-ͷத͔Βநग़͞ΕͨεΩʔϜ ϗετ ϙʔτ൪߸ͷͭʣ͕ҟͳΔͷಉ࢜ͷૢ࡞ʹ੍ݶΛՃ͍͑ͯΔ ‣ ྫ0SJHJO͕ҟͳΔͭͷ8FCϖʔδɺݪଇ͓ޓ͍ͷதΛಡΈग़ͤͳ͍ ‣ ྫҟͳΔ0SJHJOͷϦιʔεΛGFUDI Ͱऔಘͯ͠ݪଇதΛಡΈग़ͤͳ͍ ‣ ͜ͷΑ͏ͳΈΛ4BNF0SJHJO1PMJDZʢ401ʣͱݺͿ IUUQTFWJMFYBNQMFDPN IUUQTNBJMHPPHMFDPN JGSBNF JGSBNFͷ)5.-ͷಡΈग़͠ TDSJQU
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ϔομͷʹ੍ݶ͕͋Δ ‣ ༻Ͱ͖Δϝιουʹ੍ݶ͕͋Δ ‣ ʜ )551ϦΫΤετͷ੍ݶ ԋशͰ֞ؒݟ͑ͨ'FUDIͷݒ೦ࣄ߲ͷྫ IUUQTGFUDITQFDXIBUXHPSHDPSTVOTBGFSFRVFTUIFBEFSCZUF IUUQTGFUDITQFDXIBUXHPSHDPSTTBGFMJTUFESFRVFTUIFBEFS
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 40 ‣ $03#ʹΑΓอޢ͖͠Εͳ͍ϦιʔεΛɺϦιʔεఏڙऀଆͷҙਤʹΑΓɺ͞ ΒʹอޢͰ͖ΔΑ͏ʹ͢ΔΈ ‣ )551Ϩεϙϯεϔομܦ༝Ͱɺ֘ϔομΛ͏Ϩεϙϯε͕Ͳͷൣғ͔Β
ຒΊࠐΈΛड͚ͯΑ͍͔Λࢦఆ͢Δ͜ͱ͕Ͱ͖Δ $SPTT0SJHJO3FTPVSDF1PMJDZ ԋशͰ֞ؒݟ͑ͨ'FUDIͷݒ೦ࣄ߲ͷྫ IUUQTGFUDITQFDXIBUXHPSHDSPTTPSJHJOSFTPVSDFQPMJDZIFBEFS
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IUUQTGFUDITQFDXIBUXHPSHQPSUCMPDLJOH
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߈ܸऀࢹͰߟ͑Δ 8FCϒϥβͷηΩϡϦςΟ 1BSU
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ࠓͷ·ͱΊ $PODMVTJPO
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© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 99 ‣ ຊߨٛͰ༷ΛಡΜͰΈͨΓɺۛຯͨ͠Γɺ෦తʹ࣮͖ͯ͠·ͨ͠ ‣ 8FCඪ४8FCϒϥβ࣮͕લΑΓۙͳଘࡏʹͳͬͨͣɻ ‣
গͳ͘ͱࠓͳΒɺಘମͷ͠Εͳ͍ͷͰͳ͍ͣͰ͢ɻ ‣ ͦͷաఔͰ8FCΫϥΠΞϯταΠυͷηΩϡϦςΟগֶ͠ͼ·ͨ͠ɻ ‣ ࣌ؒͷ߹্ͬ͘͟ΒΜͳհͱͳͬͯ͠·ͬͨ͜ͱΛ͓ڐ͍ͩ͘͠͞ɻ ‣ ͜ͷपลΛΑΓਂֶ͘ͼ͍ͨํʹҎԼͷΑ͏ͳॻ੶Λ͓͢͢Ί͠·͢ ‣ ʰମܥతʹֶͿ҆શͳ8FCΞϓϦέʔγϣϯͷ࡞Γํ੬ऑੑ͕ੜ·ΕΔݪཧͱରࡦͷ࣮ફʱ ‣ ʰϒϥβϋοΫʱ ‣ ʰ8FCϒϥβηΩϡϦςΟʕ8FCΞϓϦέʔγϣϯͷ҆શੑΛࢧ͑ΔΈΛཧ͢Δʱ ͓ΘΓʹ #͍ͪ͞ͳ8FCϒϥβΛͭͬͯ͘ΈΑ͏
© 2021 shift-js.info ͍ͪ͞ͳWebϒϥβΛ࡞ͬͯΈΑ͏ 100 ‣ ຊߨٛͰऔΓΜͰ͖ͨҎԼͷΑ͏ͳϓϩηεɺ8FCϒϥβʹݶΒͣɺଟ ͘ͷݱͷϓϩμΫτΛཧղ͢Δ্Ͱ׆͔͢͜ͱͷͰ͖ΔͷͰ͢ɻ ‣ جૅతͳίϯηϓτΛ಄ʹೖΕΔ
‣ ͦΕΛऔΓר͘ΤίγεςϜΛΔ ‣ ༷࣮ΛಡΈղ͘ ‣ ͦ͜ʹࢸΔ·Ͱͷྺ࢙ٞΛௐࠪ͢Δ ‣ ٖࣅతʹ࣮ࡍʹ฿࣮ͯ͠ΈΔ ‣ ʜ ‣ ຊߨٛͰಘͨࣝɾܦݧɺ͜ͷखͷϝλεΩϧΛ׆͔ͯ͠ɺࠓޙΑΓ͘ɾ ਂ͘ϓϩμΫτͷηΩϡϦςΟΛߟ͑ͯΈ͍ͯͩ͘͞ʂ ͓ΘΓʹ #͍ͪ͞ͳ8FCϒϥβΛͭͬͯ͘ΈΑ͏