{"id":13920,"date":"2019-12-12T11:14:48","date_gmt":"2019-12-12T11:14:48","guid":{"rendered":"https:\/\/kiencang.net\/?p=13920"},"modified":"2019-12-12T11:14:48","modified_gmt":"2019-12-12T11:14:48","slug":"amp-la-gi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/amp-la-gi\/","title":{"rendered":"AMP l\u00e0 g\u00ec, t\u1ea1i sao n\u00f3 gi\u00fap website t\u1ea3i nhanh h\u01a1n"},"content":{"rendered":"\n<p>AMP l\u00e0 c\u00f4ng ngh\u1ec7 k\u1ebft h\u1ee3p nhi\u1ec1u bi\u1ec7n ph\u00e1p t\u1ed1i \u01b0u h\u00f3a gi\u00fap website AMP t\u1ea3i nhanh g\u1ea7n nh\u01b0 ngay l\u1eadp t\u1ee9c (load instantly). B\u1ea1n s\u1ebd th\u1ea5y l\u00fd do v\u00ec sao ngay sau \u0111\u00e2y.<\/p>\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d6cb1a7ee\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d6cb1a7ee\"  type=\"checkbox\" id=\"item-6577d6cb1a7ee\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#1_Tat_ca_cac_ma_JavaScritp_tren_AMP_duoc_thuc_thi_khong_dong_bo_asynchronously\" title=\"1. T\u1ea5t c\u1ea3 c\u00e1c m\u00e3 JavaScritp tr\u00ean AMP \u0111\u01b0\u1ee3c th\u1ef1c thi kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (asynchronously)\">1. T\u1ea5t c\u1ea3 c\u00e1c m\u00e3 JavaScritp tr\u00ean AMP \u0111\u01b0\u1ee3c th\u1ef1c thi kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (asynchronously)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#2_Nam_ro_tu_truoc_kich_co_cac_tai_nguyen_tinh\" title=\"2. N\u1eafm r\u00f5 t\u1eeb tr\u01b0\u1edbc k\u00edch c\u1ee1 c\u00e1c t\u00e0i nguy\u00ean t\u0129nh\">2. N\u1eafm r\u00f5 t\u1eeb tr\u01b0\u1edbc k\u00edch c\u1ee1 c\u00e1c t\u00e0i nguy\u00ean t\u0129nh<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#3_Khong_de_cac_co_che_ben_ngoai_chan_hien_thi\" title=\"3. Kh\u00f4ng \u0111\u1ec3 c\u00e1c c\u01a1 ch\u1ebf b\u00ean ngo\u00e0i ch\u1eb7n hi\u1ec3n th\u1ecb\">3. Kh\u00f4ng \u0111\u1ec3 c\u00e1c c\u01a1 ch\u1ebf b\u00ean ngo\u00e0i ch\u1eb7n hi\u1ec3n th\u1ecb<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#4_Ngan_tat_ca_cac_doan_ma_JavaScript_cua_ben_thu_ba_va_bat_chung_nam_ngoai_tuyen_hien_thi_quan_trong_critical_path\" title=\"4. Ng\u0103n t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript c\u1ee7a b\u00ean th\u1ee9 ba v\u00e0 b\u1eaft ch\u00fang n\u1eb1m ngo\u00e0i tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng (critical path)\">4. Ng\u0103n t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript c\u1ee7a b\u00ean th\u1ee9 ba v\u00e0 b\u1eaft ch\u00fang n\u1eb1m ngo\u00e0i tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng (critical path)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#5_Tat_ca_CSS_phai_duoc_noi_tuyen_va_co_kich_co_gioi_han\" title=\"5. T\u1ea5t c\u1ea3 CSS ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed9i tuy\u1ebfn v\u00e0 c\u00f3 k\u00edch c\u1ee1 gi\u1edbi h\u1ea1n\">5. T\u1ea5t c\u1ea3 CSS ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed9i tuy\u1ebfn v\u00e0 c\u00f3 k\u00edch c\u1ee1 gi\u1edbi h\u1ea1n<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#6_Kich_hoat_font_chu_phai_hieu_qua\" title=\"6. K\u00edch ho\u1ea1t font ch\u1eef ph\u1ea3i hi\u1ec7u qu\u1ea3\">6. K\u00edch ho\u1ea1t font ch\u1eef ph\u1ea3i hi\u1ec7u qu\u1ea3<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#7_Toi_thieu_hoa_tinh_toan_lai_style\" title=\"7. T\u1ed1i thi\u1ec3u h\u00f3a t\u00ednh to\u00e1n l\u1ea1i style\">7. T\u1ed1i thi\u1ec3u h\u00f3a t\u00ednh to\u00e1n l\u1ea1i style<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#8_Chi_chay_tang_toc_GPU_voi_animation\" title=\"8. Ch\u1ec9 ch\u1ea1y t\u0103ng t\u1ed1c GPU v\u1edbi animation\">8. Ch\u1ec9 ch\u1ea1y t\u0103ng t\u1ed1c GPU v\u1edbi animation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#9_Co_cac_muc_do_uu_tien_khac_nhau_trong_khi_tai_tai_nguyen\" title=\"9. C\u00f3 c\u00e1c m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean kh\u00e1c nhau trong khi t\u1ea3i t\u00e0i nguy\u00ean\">9. C\u00f3 c\u00e1c m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean kh\u00e1c nhau trong khi t\u1ea3i t\u00e0i nguy\u00ean<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/kiencang.net\/amp-la-gi\/#10_Tai_cac_trang_ngay_lap_tuc\" title=\"10. T\u1ea3i c\u00e1c trang ngay l\u1eadp t\u1ee9c\">10. T\u1ea3i c\u00e1c trang ngay l\u1eadp t\u1ee9c<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Tat_ca_cac_ma_JavaScritp_tren_AMP_duoc_thuc_thi_khong_dong_bo_asynchronously\"><\/span>1. T\u1ea5t c\u1ea3 c\u00e1c m\u00e3 JavaScritp tr\u00ean AMP \u0111\u01b0\u1ee3c th\u1ef1c thi kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (asynchronously)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>JavaScript l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1ea7y s\u1ee9c m\u1ea1nh, n\u00f3 c\u00f3 th\u1ec3 s\u1eeda \u0111\u1ed5i m\u1ecdi kh\u00eda c\u1ea1nh c\u1ee7a trang, nh\u01b0ng n\u00f3 c\u0169ng l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng ch\u1eb7n x\u00e2y d\u1ef1ng DOM v\u00e0 tr\u00ec ho\u00e3n render (hi\u1ec3n th\u1ecb) trang. \u0110\u1ec3 ng\u0103n JavaScript l\u00e0m tr\u00ec ho\u00e3n render trang (delaying page rendering), AMP ch\u1ec9 cho ph\u00e9p <a href=\"https:\/\/kiencang.net\/tai-javascript-defer-async\/\">JavaScript kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (async)<\/a>.<\/p>\n\n\n<p>Trang AMP kh\u00f4ng th\u1ec3 l\u1ed3ng c\u00e1c b\u1ea5t k\u1ef3 \u0111o\u1ea1n m\u00e3 JavaScript n\u00e0o do ch\u1ee7 trang vi\u1ebft (author-written). Thay v\u00ec s\u1eed d\u1ee5ng JavaScript, c\u00e1c t\u00ednh n\u0103ng t\u01b0\u01a1ng t\u00e1c trang \u0111\u01b0\u1ee3c x\u1eed l\u00fd b\u00ean trong c\u00e1c th\u00e0nh ph\u1ea7n AMP t\u00f9y ch\u1ec9nh (custom AMP elements). C\u00e1c th\u00e0nh ph\u1ea7n AMP t\u00f9y ch\u1ec9nh c\u00f3 th\u1ec3 c\u00f3 JavaScript &#8220;under the hood&#8221;, nh\u01b0ng ch\u00fang \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf m\u1ed9t c\u00e1ch c\u1ea9n th\u1eadn \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o kh\u00f4ng l\u00e0m suy gi\u1ea3m <a href=\"https:\/\/kiencang.net\/chi-so-hieu-suat-nguoi-dung\/\">ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t, t\u1ed1c \u0111\u1ed9 trang<\/a>.<\/p>\n\n\n<p>Trong khi JS c\u1ee7a b\u00ean th\u1ee9 ba \u0111\u01b0\u1ee3c cho ph\u00e9p \u0111\u01b0a v\u00e0o trong iframe, n\u00f3 kh\u00f4ng l\u00e0m ch\u1eb7n hi\u1ec3n th\u1ecb (block rendering). V\u00ed d\u1ee5, n\u1ebfu JS c\u1ee7a b\u00ean th\u1ee9 ba s\u1eed d\u1ee5ng <a href=\"http:\/\/www.stevesouders.com\/blog\/2012\/04\/10\/dont-docwrite-scripts\/\">API document.write (c\u00e1i th\u00f4ng th\u01b0\u1eddng r\u1ea5t t\u1ec7 v\u1edbi hi\u1ec7u su\u1ea5t trang)<\/a>, n\u00f3 kh\u00f4ng ch\u1eb7n hi\u1ec3n th\u1ecb trang ch\u00ednh.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Nam_ro_tu_truoc_kich_co_cac_tai_nguyen_tinh\"><\/span>2. N\u1eafm r\u00f5 t\u1eeb tr\u01b0\u1edbc k\u00edch c\u1ee1 c\u00e1c t\u00e0i nguy\u00ean t\u0129nh<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00e1c t\u00e0i nguy\u00ean b\u00ean ngo\u00e0i nh\u01b0 \u1ea3nh, qu\u1ea3ng c\u00e1o, ho\u1eb7c iframe ph\u1ea3i th\u00f4ng b\u00e1o k\u00edch c\u1ee1 trong HTML v\u00ec th\u1ebf AMP c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111\u01b0\u1ee3c k\u00edch c\u1ee1 v\u00e0 v\u1ecb tr\u00ed c\u1ee7a m\u1ed7i ph\u1ea7n t\u1eeb n\u00e0y tr\u01b0\u1edbc khi t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c t\u1ea3i xu\u1ed1ng. AMP t\u1ea3i layout (b\u1ed1 c\u1ee5c) c\u1ee7a trang m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ea3i \u0111\u1ee3i b\u1ea5t k\u1ef3 t\u00e0i nguy\u00ean n\u00e0o t\u1ea3i v\u1ec1.<\/p>\n\n\n<p>AMP t\u00e1ch layout t\u00e0i li\u1ec7u t\u1eeb layout t\u00e0i nguy\u00ean. Ch\u1ec9 m\u1ed9t y\u00eau c\u1ea7u HTTP l\u00e0 \u0111\u1ee7 \u0111\u1ec3 l\u00ean layout to\u00e0n b\u1ed9 t\u00e0i li\u1ec7u (+font). V\u00ec AMP \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 tr\u00e1nh g\u00e1nh n\u1eb7ng t\u00ednh to\u00e1n l\u1ea1i style v\u00e0 layout trong tr\u00ecnh duy\u1ec7t, n\u00f3 kh\u00f4ng c\u1ea7n d\u1ef1ng l\u1ea1i layout khi t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c t\u1ea3i v\u1ec1.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Khong_de_cac_co_che_ben_ngoai_chan_hien_thi\"><\/span>3. Kh\u00f4ng \u0111\u1ec3 c\u00e1c c\u01a1 ch\u1ebf b\u00ean ngo\u00e0i ch\u1eb7n hi\u1ec3n th\u1ecb<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>AMP ng\u0103n kh\u00f4ng cho c\u00e1c c\u01a1 ch\u1ebf b\u00ean ngo\u00e0i ch\u1eb7n hi\u1ec3n th\u1ecb trang. AMP h\u1ed7 tr\u1ee3 c\u00e1c ti\u1ec7n \u00edch m\u1edf r\u1ed9ng cho c\u00e1c th\u1ee9 nh\u01b0 lightboxes, nh\u00fang instagram, tweet, v\u00e2n v\u00e2n. Trong khi nh\u1eefng th\u1ee9 n\u00e0y v\u1eabn y\u00eau c\u1ea7u c\u00e1c k\u1ebft n\u1ed1i HTTP b\u1ed5 sung, ch\u00fang kh\u00f4ng l\u00e0m ch\u1eb7n render v\u00e0 layout trang.<\/p>\n\n\n<p>B\u1ea5t c\u1ee9 trang n\u00e0o s\u1eed d\u1ee5ng m\u00e3 t\u00f9y ch\u1ec9nh ph\u1ea3i n\u00f3i cho h\u1ec7 th\u1ed1ng AMP r\u1eb1ng n\u00f3 cu\u1ed1i c\u00f9ng s\u1ebd c\u00f3 m\u1ed9t th\u1ebb t\u00f9y ch\u1ec9nh. V\u00ed d\u1ee5, script <em>amp-iframe<\/em> n\u00f3i cho h\u1ec7 th\u1ed1ng r\u1eb1ng s\u1ebd c\u00f3 m\u1ed9t th\u1ebb <em>amp-iframe<\/em>. AMP t\u1ea1o ra h\u1ed9p iframe th\u1eadm ch\u00ed tr\u01b0\u1edbc c\u1ea3 khi n\u00f3 bi\u1ebft c\u00e1i g\u00ec \u0111\u01b0\u1ee3c ch\u1ee9a \u1edf b\u00ean trong:<\/p>\n\n\n<div class=\"ap-m-copy ap-m-copy-right-small\">\n<div class=\"-nc\">\n<pre><span class=\"p\">&lt;<\/span><span class=\"nt\">script<\/span> <span class=\"na\">async<\/span> <span class=\"na\">custom-element<\/span><span class=\"o\">=<\/span><span class=\"s\">\"amp-iframe\"<\/span> <span class=\"na\">src<\/span><span class=\"o\">=<\/span><span class=\"s\">\"https:\/\/cdn.ampproject.org\/v0\/amp-iframe-0.1.js\"<\/span><span class=\"p\">&gt;&lt;\/<\/span><span class=\"nt\">script<\/span><span class=\"p\">&gt;<\/span><\/pre>\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Ngan_tat_ca_cac_doan_ma_JavaScript_cua_ben_thu_ba_va_bat_chung_nam_ngoai_tuyen_hien_thi_quan_trong_critical_path\"><\/span>4. Ng\u0103n t\u1ea5t c\u1ea3 c\u00e1c \u0111o\u1ea1n m\u00e3 JavaScript c\u1ee7a b\u00ean th\u1ee9 ba v\u00e0 b\u1eaft ch\u00fang n\u1eb1m ngo\u00e0i tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng (critical path)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>JS c\u1ee7a <a href=\"https:\/\/kiencang.net\/tai-nguyen-ben-thu-ba-wordpress\/\">b\u00ean th\u1ee9 ba<\/a> th\u01b0\u1eddng th\u00edch t\u1ea3i JS theo c\u00e1ch \u0111\u1ed3ng b\u1ed9. H\u1ecd c\u0169ng th\u00edch d\u00f9ng <em>document.write<\/em> c\u00f3 nhi\u1ec1u script \u0111\u1ed3ng b\u1ed9. V\u00ed d\u1ee5, n\u1ebfu b\u1ea1n c\u00f3 n\u0103m qu\u1ea3ng c\u00e1o tr\u00ean trang, v\u00e0 m\u1ed7i c\u00e1i trong s\u1ed1 ch\u00fang t\u1ea1o ra th\u00eam ba l\u01b0\u1ee3t t\u1ea3i \u0111\u1ed3ng b\u1ed9 (synchronous loads), m\u1ed7i l\u01b0\u1ee3t t\u1ea3i c\u00f3 \u0111\u1ed9 tr\u1ec5 k\u1ebft n\u1ed1i l\u00e0 1 gi\u00e2y, gi\u1edd b\u1ea1n s\u1ebd m\u1ea5t \u0111\u1ebfn 15s ch\u1ec9 \u0111\u1ec3 ch\u1edd \u0111\u1ee3i t\u1ea3i JS v\u1ec1.<\/p>\n\n\n<p>Trang AMP cho ph\u00e9p JavaScript c\u1ee7a b\u00ean th\u1ee9 ba nh\u01b0ng ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e9p trong iframe sandbox. B\u1eb1ng c\u00e1ch h\u1ea1n ch\u1ebf ch\u00fang v\u00e0o iframe, ch\u00fang kh\u00f4ng th\u1ec3 ch\u1eb7n th\u1ef1c thi c\u1ee7a trang ch\u00ednh. Th\u1eadm ch\u00ed n\u1ebfu ch\u00fang \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t t\u00ednh to\u00e1n l\u1ea1i style nhi\u1ec1u l\u1ea7n, \u1ea3nh h\u01b0\u1edfng s\u1ebd l\u00e0 r\u1ea5t nh\u1ecf v\u00ec iframe c\u1ee7a ch\u00fang c\u00f3 r\u1ea5t \u00edt DOM.<\/p>\n\n\n<p>Th\u1eddi gian c\u1ea7n thi\u1ebft \u0111\u1ec3 t\u00ednh to\u00e1n l\u1ea1i style v\u00e0 layout b\u1ecb gi\u1edbi h\u1ea1n (quy\u1ebft \u0111\u1ecbnh) b\u1edfi k\u00edch c\u1ee1 DOM, v\u00ec th\u1ebf vi\u1ec7c t\u00ednh to\u00e1n l\u1ea1i iframe l\u00e0 r\u1ea5t nhanh so v\u1edbi vi\u1ec7c t\u00ednh to\u00e1n l\u1ea1i style v\u00e0 layout cho trang.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Tat_ca_CSS_phai_duoc_noi_tuyen_va_co_kich_co_gioi_han\"><\/span>5. T\u1ea5t c\u1ea3 CSS ph\u1ea3i \u0111\u01b0\u1ee3c n\u1ed9i tuy\u1ebfn v\u00e0 c\u00f3 k\u00edch c\u1ee1 gi\u1edbi h\u1ea1n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>CSS ch\u1eb7n t\u1ea5t c\u1ea3 hi\u1ec3n th\u1ecb, n\u00f3 ch\u1eb7n t\u1ea3i trang, v\u00e0 n\u00f3 c\u00f3 xu h\u01b0\u1edbng ng\u00e0y c\u00e0ng c\u1ed3ng k\u1ec1nh. Trong trang HTML AMP, ch\u1ec9 style n\u1ed9i tuy\u1ebfn l\u00e0 \u0111\u01b0\u1ee3c ph\u00e9p. \u0110i\u1ec1u n\u00e0y lo\u1ea1i b\u1ecf 1 ho\u1eb7c th\u01b0\u1eddng l\u00e0 nhi\u1ec1u y\u00eau c\u1ea7u HTTP t\u1eeb <a href=\"https:\/\/kiencang.net\/duong-dan-hien-thi-trang-quan-trong\/\">tuy\u1ebfn hi\u1ec3n th\u1ecb quan tr\u1ecdng<\/a> (critical rendering path) so v\u1edbi h\u1ea7u h\u1ebft c\u00e1c trang web.<\/p>\n\n\n<p>Ngo\u00e0i ra, style n\u1ed9i tuy\u1ebfn (inline) ch\u1ec9 \u0111\u01b0\u1ee3c ph\u00e9p c\u00f3 k\u00edch c\u1ee1 t\u1ed1i \u0111a l\u00e0 50 kilobytes. Trong khi k\u00edch c\u1ee1 n\u00e0y l\u00e0 \u0111\u1ee7 l\u1edbn cho m\u1ecdi trang c\u00f3 k\u1ebft c\u1ea5u, phong c\u00e1ch tinh vi, ph\u1ee9c t\u1ea1p, n\u00f3 v\u1eabn y\u00eau c\u1ea7u ng\u01b0\u1eddi l\u1eadp tr\u00ecnh ph\u1ea3i c\u00f3 k\u1ef9 n\u0103ng th\u1ee5c h\u00e0nh t\u1ed1i \u01b0u CSS th\u1eadt t\u1ed1t.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_Kich_hoat_font_chu_phai_hieu_qua\"><\/span>6. K\u00edch ho\u1ea1t font ch\u1eef ph\u1ea3i hi\u1ec7u qu\u1ea3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Font ch\u1eef hay c\u00f3 k\u00edch c\u1ee1 l\u1edbn, v\u00ec th\u1ebf t\u1ed1i \u01b0u h\u00f3a font l\u00e0 \u0111i\u1ec1u quan tr\u1ecdng trong <a href=\"https:\/\/kiencang.net\/tang-toc-wordpress\/\">t\u0103ng t\u1ed1c website<\/a>. Tr\u00ean m\u1ed9t trang web \u0111i\u1ec3n h\u00ecnh th\u01b0\u1eddng c\u00f3 v\u00e0i m\u00e3 \u0111\u1ed3ng b\u1ed9 v\u00e0 v\u00e0i style ngo\u00e0i, tr\u00ecnh duy\u1ec7t ph\u1ea3i \u0111\u1ee3i \u0111\u1ec3 t\u1ea3i nh\u1eefng font l\u1edbn v\u00ec n\u00f3 ph\u1ea3i ch\u1edd m\u00e3 v\u00e0 style t\u1ea3i xong tr\u01b0\u1edbc.<\/p>\n\n\n<p>H\u1ec7 th\u1ed1ng c\u1ee7a AMP kh\u00f4ng y\u00eau c\u1ea7u HTTP cho \u0111\u1ebfn khi c\u00e1c font b\u1eaft \u0111\u1ea7u t\u1ea3i. \u0110i\u1ec1u n\u00e0y ch\u1ec9 c\u00f3 th\u1ec3 l\u00e0m \u0111\u01b0\u1ee3c nh\u01b0 th\u1ebf l\u00e0 nh\u1edd t\u1ea5t c\u1ea3 JS trong AMP \u0111\u1ec1u c\u00f3 thu\u1ed9c t\u00ednh kh\u00f4ng \u0111\u1ed3ng b\u1ed9 v\u00e0 ch\u1ec9 style n\u1ed9i tuy\u1ebfn l\u00e0 \u0111\u01b0\u1ee3c ph\u00e9p; kh\u00f4ng c\u00f3 c\u00e1c y\u00eau c\u1ea7u HTTP ch\u1eb7n tr\u00ecnh duy\u1ec7t t\u1ea3i font.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"7_Toi_thieu_hoa_tinh_toan_lai_style\"><\/span>7. T\u1ed1i thi\u1ec3u h\u00f3a t\u00ednh to\u00e1n l\u1ea1i style<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>M\u1ed7i khi b\u1ea1n &#8220;\u0111o&#8221; (th\u00eam, b\u1edbt, \u0111i\u1ec1u ch\u1ec9nh k\u00edch c\u1ee1 ph\u1ea7n t\u1eed trong HTML) m\u1ed9t th\u1ee9 g\u00ec \u0111\u00f3, n\u00f3 s\u1ebd k\u00edch ho\u1ea1t vi\u1ec7c t\u00ednh to\u00e1n l\u1ea1i style &#8211; c\u00e1i s\u1ebd l\u00e0 g\u00e1nh n\u1eb7ng v\u00ec tr\u00ecnh duy\u1ec7t s\u1ebd ph\u1ea3i l\u00ean layout l\u1ea1i to\u00e0n trang. Trong trang AMP, t\u1ea5t c\u1ea3 c\u00e1c l\u1ea7n \u0111\u1ecdc DOM x\u1ea3y ra tr\u01b0\u1edbc t\u1ea5t c\u1ea3 c\u00e1c l\u1ea7n ghi. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o c\u00f3 t\u1ed1i \u0111a m\u1ed9t l\u1ea7n t\u00ednh to\u00e1n l\u1ea1i style ch\u1ed7 m\u1ed7i frame.<\/p>\n\n\n<p>B\u1ea1n c\u00f3 th\u1ec3 \u0111\u00e0o s\u00e2u h\u01a1n v\u1ec1 \u1ea3nh h\u01b0\u1edfng c\u1ee7a t\u00ednh to\u00e1n l\u1ea1i style v\u00e0 layout th\u00f4ng qua c\u00e1c b\u00e0i vi\u1ebft v\u1ec1 hi\u1ec7u su\u1ea5t hi\u1ec3n th\u1ecb (renderring performance).<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"8_Chi_chay_tang_toc_GPU_voi_animation\"><\/span>8. Ch\u1ec9 ch\u1ea1y t\u0103ng t\u1ed1c GPU v\u1edbi animation<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00e1ch duy nh\u1ea5t \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a nhanh l\u00e0 ch\u1ea1y ch\u00fang tr\u00ean GPU. GPU bi\u1ebft v\u1ec1 c\u00e1c l\u1edbp, n\u00f3 bi\u1ebft c\u00e1ch th\u1ef1c thi m\u1ed9t s\u1ed1 th\u1ee9 tr\u00ean c\u00e1c l\u1edbp n\u00e0y, n\u00f3 c\u00f3 th\u1ec3 di chuy\u1ec3n ch\u00fang, n\u00f3 c\u00f3 th\u1ec3 fade ch\u00fang, nh\u01b0ng n\u00f3 kh\u00f4ng th\u1ec3 c\u1eadp nh\u1eadt layout c\u1ee7a trang; n\u00f3 s\u1ebd giao nhi\u1ec7m v\u1ee5 \u0111\u00f3 cho tr\u00ecnh duy\u1ec7t, v\u00e0 \u0111i\u1ec1u \u0111\u00f3 kh\u00f4ng t\u1ed1t.<\/p>\n\n\n<p>C\u00e1c quy t\u1eafc cho CSS li\u00ean quan \u0111\u1ebfn animation \u0111\u1ea3m b\u1ea3o r\u1eb1ng animation c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u0103ng t\u1ed1c GPU. C\u1ee5 th\u1ec3, AMP ch\u1ec9 cho ph\u00e9p animation v\u00e0 transition tr\u00ean transform v\u00e0 opacity, v\u00ec th\u1ebf layout c\u1ee7a trang kh\u00f4ng c\u1ea7n y\u00eau c\u1ea7u.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"9_Co_cac_muc_do_uu_tien_khac_nhau_trong_khi_tai_tai_nguyen\"><\/span>9. C\u00f3 c\u00e1c m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean kh\u00e1c nhau trong khi t\u1ea3i t\u00e0i nguy\u00ean<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>AMP \u0111i\u1ec1u khi\u1ec3n t\u1ea5t c\u1ea3 c\u00e1c nhi\u1ec7m v\u1ee5 t\u1ea3i t\u00e0i nguy\u00ean: n\u00f3 c\u00f3 m\u1ee9c \u01b0u ti\u00ean trong t\u1ea3i t\u00e0i nguy\u00ean, t\u1ea3i ch\u1ec9 khi c\u1ea7n thi\u1ebft, v\u00e0 t\u00ecm n\u1ea1p tr\u01b0\u1edbc c\u00e1c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c <a href=\"https:\/\/kiencang.net\/ly-giai-don-gian-ve-lazy-load\/\">lazy-load<\/a>.<\/p>\n\n\n<p>Khi AMP t\u1ea3i c\u00e1c t\u00e0i nguy\u00ean, n\u00f3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c t\u1ea3i v\u00ec th\u1ebf c\u00e1c t\u00e0i nguy\u00ean quan tr\u1ecdng nh\u1ea5t \u1edf th\u1eddi \u0111i\u1ec3m \u0111\u00f3 s\u1ebd \u0111\u01b0\u1ee3c t\u1ea3i xu\u1ed1ng tr\u01b0\u1edbc. \u1ea2nh v\u00e0 qu\u1ea3ng c\u00e1o ch\u1ec9 \u0111\u01b0\u1ee3c t\u1ea3i n\u1ebfu ch\u00fang c\u00f3 kh\u1ea3 n\u0103ng n\u1eb1m trong t\u1ea7m m\u1eaft c\u1ee7a ng\u01b0\u1eddi d\u00f9ng, n\u1eb1m tr\u00ean <a href=\"https:\/\/kiencang.net\/man-hinh-dau-tien\/\">m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean (above-the-fold)<\/a>, ho\u1eb7c n\u1ebfu ng\u01b0\u1eddi d\u00f9ng c\u00f3 kh\u1ea3 n\u0103ng cu\u1ed9n chu\u1ed9t nhanh \u0111\u1ebfn ch\u00fang.<\/p>\n\n\n<p>AMP c\u0169ng t\u00ecm n\u1ea1p tr\u01b0\u1edbc c\u00e1c t\u00e0i nguy\u00ean lazy-load. C\u00e1c t\u00e0i nguy\u00ean \u0111\u01b0\u1ee3c t\u1ea3i mu\u1ed9n nh\u1ea5t c\u00f3 th\u1ec3, nh\u01b0ng l\u1ea1i \u0111\u01b0\u1ee3c t\u00ecm n\u1ea1p s\u1edbm nh\u1ea5t c\u00f3 th\u1ec3. B\u1eb1ng c\u00e1ch \u0111\u00f3 m\u1ecdi th\u1ee9 \u0111\u01b0\u1ee3c t\u1ea3i r\u1ea5t nhanh nh\u01b0ng CPU ch\u1ec9 s\u1eed d\u1ee5ng khi t\u00e0i nguy\u00ean th\u1ef1c s\u1ef1 hi\u1ec3n th\u1ecb cho ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"10_Tai_cac_trang_ngay_lap_tuc\"><\/span>10. T\u1ea3i c\u00e1c trang ngay l\u1eadp t\u1ee9c<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p><a href=\"http:\/\/www.w3.org\/TR\/resource-hints\/#dfn-preconnect\">API preconnect<\/a> m\u1edbi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng nhi\u1ec1u \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c y\u00eau c\u1ea7u HTTP l\u00e0 nhanh nh\u1ea5t c\u00f3 th\u1ec3 khi ch\u00fang \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n. V\u1edbi c\u00e1i n\u00e0y, trang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c render tr\u01b0\u1edbc khi ng\u01b0\u1eddi d\u00f9ng th\u1ef1c s\u1ef1 \u0111i\u1ec1u h\u01b0\u1edbng \u0111\u1ebfn n\u00f3; trang c\u00f3 th\u1ec3 \u0111\u00e3 c\u00f3 s\u1eb5n v\u00e0o th\u1eddi \u0111i\u1ec3m ng\u01b0\u1eddi d\u00f9ng ch\u1ecdn n\u00f3, l\u00e0m cho n\u00f3 t\u1ea3i nhanh ngay l\u1eadp t\u1ee9c. B\u1ea1n c\u00f3 th\u1ec3 tham kh\u1ea3o b\u00e0i vi\u1ebft <a href=\"https:\/\/kiencang.net\/preload-prefetch-preconnect\/\">t\u00ecm hi\u1ec3u preload, prefetch v\u00e0 preconnect<\/a> \u0111\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e1c c\u01a1 ch\u1ebf g\u1ee3i \u00fd t\u00e0i nguy\u00ean.<\/p>\n\n\n<p>Trong khi prerendering (render tr\u01b0\u1edbc) c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng l\u00ean t\u1ea5t c\u1ea3 c\u00e1c n\u1ed9i dung web, n\u00f3 c\u00f3 th\u1ec3 l\u00e0m gia t\u0103ng s\u1eed d\u1ee5ng b\u0103ng th\u00f4ng v\u00e0 CPU. AMP \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a \u0111\u1ec3 l\u00e0m gi\u1ea3m c\u1ea3 hai y\u1ebfu t\u1ed1 n\u00e0y. Prerendering ch\u1ec9 t\u1ea3i c\u00e1c t\u00e0i nguy\u00ean trong m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean v\u00e0 prerendering kh\u00f4ng render nh\u1eefng ph\u1ea7n t\u1eed g\u00e2y g\u00e1nh n\u1eb7ng cho CPU.<\/p>\n\n\n<p>Khi trang AMP th\u1ef1c hi\u1ec7n prerender cho nhi\u1ec7m v\u1ee5 instant loading, ch\u1ec9 c\u00e1c t\u00e0i nguy\u00ean trong m\u00e0n h\u00ecnh \u0111\u1ea7u ti\u00ean th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c t\u1ea3i. Khi trang AMP th\u1ef1c hi\u1ec7n prerender cho nhi\u1ec7m v\u1ee5 instant loading, c\u00e1c t\u00e0i nguy\u00ean c\u00f3 kh\u1ea3 n\u0103ng s\u1eed d\u1ee5ng nhi\u1ec1u CPU (ch\u1eb3ng h\u1ea1n nh\u01b0 iframe c\u1ee7a b\u00ean th\u1ee9 ba) s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c t\u1ea3i.<\/p>\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft How AMP works c\u1ee7a trang amp[.]dev)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>AMP l\u00e0 c\u00f4ng ngh\u1ec7 k\u1ebft h\u1ee3p nhi\u1ec1u bi\u1ec7n ph\u00e1p t\u1ed1i \u01b0u h\u00f3a gi\u00fap website AMP t\u1ea3i nhanh g\u1ea7n nh\u01b0 ngay l\u1eadp t\u1ee9c (load instantly). B\u1ea1n s\u1ebd th\u1ea5y l\u00fd do v\u00ec sao ngay sau \u0111\u00e2y. 1. T\u1ea5t c\u1ea3 c\u00e1c m\u00e3 JavaScritp tr\u00ean AMP \u0111\u01b0\u1ee3c th\u1ef1c thi kh\u00f4ng \u0111\u1ed3ng b\u1ed9 (asynchronously) JavaScript l\u00e0 c\u00f4ng c\u1ee5 \u0111\u1ea7y s\u1ee9c &hellip;<\/p>\n","protected":false},"author":1,"featured_media":13924,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[244],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>AMP l\u00e0 g\u00ec, t\u1ea1i sao n\u00f3 gi\u00fap website t\u1ea3i nhanh h\u01a1n &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/amp-la-gi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"AMP l\u00e0 g\u00ec, t\u1ea1i sao n\u00f3 gi\u00fap website t\u1ea3i nhanh h\u01a1n &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"AMP l\u00e0 c\u00f4ng ngh\u1ec7 k\u1ebft h\u1ee3p nhi\u1ec1u bi\u1ec7n ph\u00e1p t\u1ed1i \u01b0u h\u00f3a gi\u00fap website AMP t\u1ea3i nhanh g\u1ea7n nh\u01b0 ngay l\u1eadp t\u1ee9c (load instantly). B\u1ea1n s\u1ebd th\u1ea5y l\u00fd do v\u00ec sao ngay sau \u0111\u00e2y. 1. 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