Web\u30b5\u30a4\u30c8\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306b\u304a\u3044\u3066\u3001\u753b\u50cf\u3084\u52d5\u753b\u306e\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff08Lazy Loading\uff09\u306f\u5fc5\u9808\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u5b9f\u969b\u306b\u5b9f\u88c5\u3057\u3088\u3046\u3068\u3059\u308b\u3068\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u554f\u984c\u306b\u76f4\u9762\u3057\u307e\u3059\uff1a<\/p>\r\n
<picture><\/code>\u30bf\u30b0\u3067\u306e\u753b\u50cf\u5207\u308a\u66ff\u3048\u306f\u3088\u304f\u898b\u304b\u3051\u308b\u304c\u3001\u52d5\u753b\u3084iframe\u3067\u306f\uff1f<\/li>\r\n <video><\/code>\u30bf\u30b0\u306emedia<\/code>\u5c5e\u6027\u306fiPhone\u3067\u52d5\u4f5c\u3057\u306a\u3044\u3053\u3068\u304c\u3042\u308b<\/li>\r\n - iframe\uff08youtube\uff09\u306e\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5207\u308a\u66ff\u3048\u306e\u60c5\u5831\u304c\u5c11\u306a\u3044<\/li>\r\n
- \u30c7\u30d0\u30a4\u30b9\u30b5\u30a4\u30ba\u306b\u5fdc\u3058\u3066\u6700\u9069\u306a\u30e1\u30c7\u30a3\u30a2\u3092\u914d\u4fe1\u3057\u305f\u3044<\/li>\r\n<\/ul>\r\n
\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u554f\u984c\u3092response.js\uff08response-lazy.js\uff09<\/b>\u3067\u4e00\u6c17\u306b\u89e3\u6c7a\u3059\u308b\u65b9\u6cd5\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\r\n\r\n \r\n<\/ul>\r\n<\/ins>\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n
\r\n\u5f93\u6765\u306e\u65b9\u6cd5\u306e\u554f\u984c\u70b9<\/h2>\r\n1. <picture><\/code>\u30bf\u30b0 - \u753b\u50cf\u306e\u307f\u5bfe\u5fdc<\/h3>\r\n<!-- \u753b\u50cf\u306f\u554f\u984c\u306a\u3057 -->\r\n<picture>\r\n <source media="(max-width: 743.9px)" srcset="img\/photo_sp.jpg" \/>\r\n <img src="img\/photo_pc.jpg" alt="\u5199\u771f" \/>\r\n<\/picture>\r\n<\/code><\/pre>\r\n\u826f\u3044\u70b9\uff1a<\/b><\/p>\r\n\r\n - \u2705 \u30d6\u30e9\u30a6\u30b6\u30cd\u30a4\u30c6\u30a3\u30d6\u3067\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5bfe\u5fdc<\/li>\r\n
- \u2705 SEO\u30d5\u30ec\u30f3\u30c9\u30ea\u30fc<\/li>\r\n<\/ul>\r\n
\u554f\u984c\u70b9\uff1a<\/b><\/p>\r\n\r\n - \u274c \u753b\u50cf\u306b\u3057\u304b\u4f7f\u3048\u306a\u3044<\/li>\r\n
- \u274c \u52d5\u753b\u3001iframe\u3001embed\u306b\u306f\u975e\u5bfe\u5fdc<\/li>\r\n<\/ul>\r\n
\r\n2. <video><\/code>\u30bf\u30b0\u306emedia<\/code>\u5c5e\u6027 - iPhone \u3067\u52d5\u4f5c\u4e0d\u5b89\u5b9a<\/h3>\r\n<!-- iPhone\u3067\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u306a\u3044\u3053\u3068\u304c\u3042\u308b -->\r\n<video>\r\n <source src="\/movie\/mv_sp.mp4" type="video\/mp4" media="(max-width: 799px)">\r\n <source src="\/movie\/mv_pc.mp4" type="video\/mp4">\r\n<\/video>\r\n<\/code><\/pre>\r\n\u554f\u984c\u70b9\uff1a<\/b><\/p>\r\n\r\n - \u274c Safari\u3067\u306e\u52d5\u4f5c\u304c\u4e0d\u5b89\u5b9a<\/li>\r\n
- \u274c \u7279\u306biPhone\u3067\u5207\u308a\u66ff\u308f\u3089\u306a\u3044\u30b1\u30fc\u30b9\u304c\u591a\u3044<\/li>\r\n
- \u274c \u30d6\u30e9\u30a6\u30b6\u9593\u306e\u6319\u52d5\u304c\u7570\u306a\u308b<\/li>\r\n<\/ul>\r\n
\r\n3. iframe\u306e\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u5207\u308a\u66ff\u3048 - \u60c5\u5831\u304c\u5c11\u306a\u3044<\/h3>\r\n
\u300ciframe \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6 \u5207\u308a\u66ff\u3048\u300d\u3067\u691c\u7d22\u3057\u3066\u3082\u3001\u30a2\u30b9\u30da\u30af\u30c8\u6bd4\u3092\u4fdd\u3064\u65b9\u6cd5<\/b>\u3070\u304b\u308a\u3067\u3001\u30c7\u30d0\u30a4\u30b9\u3054\u3068\u306b\u7570\u306a\u308b\u30b3\u30f3\u30c6\u30f3\u30c4\u3092\u8868\u793a\u3059\u308b\u65b9\u6cd5\u306f\u307b\u3068\u3093\u3069\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3002<\/p>\r\n<!-- \u3053\u3046\u3044\u3046\u3053\u3068\u304c\u3057\u305f\u3044\u3051\u3069\u3001\u65b9\u6cd5\u304c\u5206\u304b\u3089\u306a\u3044 -->\r\n<iframe src="\u3069\u3046\u3084\u3063\u3066\u5207\u308a\u66ff\u3048\u308b\uff1f"><\/iframe>\r\n<\/code><\/pre>\r\n\r\n
\r\n\r\n\u89e3\u6c7a\u7b56\uff1aresponse.js<\/h2>\r\n
response.js<\/b>\u3092\u4f7f\u3048\u3070\u3001\u753b\u50cf\u30fb\u52d5\u753b\u30fbiframe\u3092\u7d71\u4e00\u7684\u306a\u65b9\u6cd5\u3067\u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\uff06\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3067\u304d\u307e\u3059\u3002<\/p>\r\n
ryanve\/response.js: Responsive design toolkit(Github)<\/b>
\r\n https:\/\/github.com\/ryanve\/response.js<\/a>\r\n<\/p>\r\n\u7279\u5fb4<\/h3>\r\n\r\n - \ud83d\udcf1 \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6<\/b>: \u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u306b\u5fdc\u3058\u305f\u30e1\u30c7\u30a3\u30a2\u914d\u4fe1<\/li>\r\n
- \ud83c\udfac \u591a\u6a5f\u80fd<\/b>: img, video, iframe, embed, object\u306b\u5bfe\u5fdc<\/li>\r\n
- \ud83c\udf4e \u30af\u30ed\u30b9\u30d6\u30e9\u30a6\u30b6<\/b>: iPhone\/Safari\u542b\u3081\u5b89\u5b9a\u52d5\u4f5c<\/li>\r\n
- \ud83d\ude80 \u9045\u5ef6\u8aad\u307f\u8fbc\u307f<\/b>: IntersectionObserver\u3067\u52b9\u7387\u7684\u306a\u9045\u5ef6\u8aad\u307f\u8fbc\u307f\uff08response-lazy.js\uff09<\/li>\r\n<\/ul>\r\n\r\n
\r\n\r\n\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\r\n<!DOCTYPE html>\r\n<html lang="ja">\r\n<head>\r\n <meta charset="UTF-8">\r\n <meta name="viewport" content="width=device-width, initial-scale=1.0">\r\n <title>My Website<\/title>\r\n<\/head>\r\n<!-- Breakpoints \u306e\u8a2d\u5b9a -->\r\n<body data-responsejs='{"create": [\r\n{ "prop":"width", "prefix":"src", "mode":"src", "breakpoints":[0,440,744,768,960,1200] },\r\n{ "prop":"width", "prefix":"r", "mode":"markup", "breakpoints":[0,440,744,768,960,1200] }\r\n]}'>\r\n <!-- \u30b3\u30f3\u30c6\u30f3\u30c4 -->\r\n \u2307\r\n \u2307\r\n\r\n <!-- response.js \u3092body\u7d42\u4e86\u30bf\u30b0\u306e\u76f4\u524d\u3067\u8aad\u307f\u8fbc\u307f -->\r\n <script src="https:\/\/unpkg.com\/@sarap422\/response-lazy@0.10.3\/response.min.js"><\/script>\r\n <script src="https:\/\/unpkg.com\/@sarap422\/response-lazy@0.10.3\/response-lazy.min.js"><\/script>\r\n<\/body>\r\n<\/html>\r\n<\/code><\/pre>\r\n\r\n\u753b\u50cf\u30fb\u52d5\u753b\u30fbiframe\u30bf\u30b0 \u306b\u66f8\u304f\u30eb\u30fc\u30eb<\/h3>\r\n\r\n class="lazy"<\/code><\/b> \u3092\u8ffd\u52a0<\/li>\r\n src<\/code><\/b> \u306b1px\u900f\u660eGIF\u3092\u8a2d\u5b9a\uff08\u30d7\u30ec\u30fc\u30b9\u30db\u30eb\u30c0\u30fc\uff09<\/li>\r\n data-src\u25cb\u25cb<\/code><\/b> \u306b\u5b9f\u969b\u306e\u753b\u50cf\/\u52d5\u753bURL\u3092\u8a2d\u5b9a<\/li>\r\n loading="lazy"<\/code>\u3068\u4f75\u7528\u3057\u306a\u3044<\/b>\uff08response-lazy.js\u3068\u7af6\u5408\u3057\u307e\u3059\uff09<\/li>\r\n fetchpriority="low"<\/code>\u306f\u4e0d\u8981<\/b>\uff08\u52b9\u679c\u304c\u5c0f\u3055\u3044\uff09<\/li>\r\n<\/ol>\r\n
\r\n\u5b9f\u88c5\u4f8b<\/h2>\r\n\u4f8b1: \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u753b\u50cf\uff08\u57fa\u672c\uff09<\/h3>\r\n<img \r\n class="lazy" \r\n style="aspect-ratio:16\/9;"\r\n src="data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" \r\n data-src0="img\/photo_mobile.jpg" \r\n data-src744="img\/photo_desktop.jpg" \r\n alt="\u5546\u54c1\u5199\u771f"\r\n\/>\r\n<\/code><\/pre>\r\n\u52d5\u4f5c:<\/b><\/p>\r\n\r\n - 743px\u4ee5\u4e0b:
photo_mobile.jpg<\/code><\/li>\r\n - 744px\u4ee5\u4e0a:
photo_desktop.jpg<\/code><\/li>\r\n<\/ul>\r\n
\r\n\u4f8b2: \u30ec\u30b9\u30dd\u30f3\u30b7\u30d6\u52d5\u753b\uff08iPhone\u3067\u3082\u52d5\u4f5c\uff01\uff09<\/h3>\r\n<video \r\n class="lazy" \r\n style="aspect-ratio:16\/9;" \r\n src="data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" \r\n data-src0="video\/hero_sp.mp4" \r\n data-src744="video\/hero_pc.mp4" \r\n autoplay muted playsinline loop\r\n><\/video>\r\n<\/code><\/pre>\r\n\u30dd\u30a4\u30f3\u30c8:<\/b><\/p>\r\n\r\n - \u2705 iPhone\/Safari\u3067\u3082\u6b63\u5e38\u306b\u52d5\u4f5c<\/li>\r\n
- \u2705
<video><\/code>\u306emedia<\/code>\u5c5e\u6027\u4e0d\u8981<\/li>\r\n - \u2705 \u9045\u5ef6\u8aad\u307f\u8fbc\u307f\u3067\u521d\u671f\u30ed\u30fc\u30c9\u6642\u9593\u3092\u77ed\u7e2e<\/li>\r\n<\/ul>\r\n
\r\n\u4f8b3: YouTube\u57cb\u3081\u8fbc\u307f\uff08iframe\uff09<\/h3>\r\n<div style="aspect-ratio:16\/9;">\r\n <iframe class="lazy" \r\n src="data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" \r\n data-src0="https:\/\/www.youtube.com\/embed\/VIDEO_ID_SP" \r\n data-src744="https:\/\/www.youtube.com\/embed\/VIDEO_ID_PC" \r\n frameborder="0" \r\n allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen muted\r\n ><\/iframe>\r\n<\/div>\r\n<\/code><\/pre>\r\n\u7528\u9014:<\/b><\/p>\r\n\r\n - \u30e2\u30d0\u30a4\u30eb\u3068\u30c7\u30b9\u30af\u30c8\u30c3\u30d7\u3067\u7570\u306a\u308b\u52d5\u753b\u3092\u8868\u793a<\/li>\r\n
- \u7e26\u753b\u9762\u7528\u3068\u6a2a\u753b\u9762\u7528\u3067\u5225\u306e\u52d5\u753b<\/li>\r\n
- \u77ed\u3044\u7248\u3068\u9577\u3044\u7248\u306e\u4f7f\u3044\u5206\u3051<\/li>\r\n<\/ul>\r\n
\r\n\u4f8b4: \u8907\u6570\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8<\/h3>\r\n<img \r\n class="lazy" \r\n style="aspect-ratio:21\/9;" \r\n src="data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==" \r\n data-src0="img\/hero_mobile.jpg" \r\n data-src440="img\/hero_small.jpg" \r\n data-src744="img\/hero_tablet.jpg" \r\n data-src1200="img\/hero_desktop.jpg" \r\n alt="\u30e1\u30a4\u30f3\u30d3\u30b8\u30e5\u30a2\u30eb"\r\n\/>\r\n<\/code><\/pre>\r\n\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8:<\/b><\/p>\r\n\r\n - 0-439px:
hero_mobile.jpg<\/code><\/li>\r\n - 440-743px:
hero_small.jpg<\/code><\/li>\r\n - 744-1199px:
hero_tablet.jpg<\/code><\/li>\r\n - 1200px\u4ee5\u4e0a:
hero_desktop.jpg<\/code><\/li>\r\n<\/ul>\r\n\r\n
\r\n\r\n\u30d6\u30ec\u30fc\u30af\u30dd\u30a4\u30f3\u30c8\u306e\u8a2d\u5b9a<\/h3>\r\n