{"id":16858,"date":"2022-02-13T10:00:00","date_gmt":"2022-02-13T03:00:00","guid":{"rendered":"https:\/\/kiencang.net\/?p=15125"},"modified":"2022-02-13T10:00:00","modified_gmt":"2022-02-13T03:00:00","slug":"dam-bao-van-ban-hien-thi","status":"publish","type":"post","link":"https:\/\/kiencang.net\/dam-bao-van-ban-hien-thi\/","title":{"rendered":"\u0110\u1ea3m b\u1ea3o v\u0103n b\u1ea3n v\u1eabn hi\u1ec3n th\u1ecb trong khi font t\u00f9y ch\u1ec9nh t\u1ea3i v\u1ec1"},"content":{"rendered":"\n<p class=\"has-background\" style=\"background-color:#ff8b8b\">V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: font t\u00f9y ch\u1ec9nh- khi s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch kh\u00e9o l\u00e9o, s\u1ebd gi\u00fap t\u0103ng t\u00ednh th\u1ea9m m\u1ef9, c\u00e1 t\u00ednh c\u1ee7a trang, v\u00e0 \u0111\u00f3 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u0111\u1ec3 thu h\u00fat ng\u01b0\u1eddi d\u00f9ng, ch\u00fang ta kh\u00f4ng n\u00ean c\u1ef1c \u0111oan lo\u1ea1i b\u1ecf n\u00f3 ch\u1ec9 \u0111\u1ec3 t\u1ed1c \u0111\u1ed9 t\u0103ng th\u00eam. Tuy nhi\u00ean, m\u1eb7t kh\u00e1c, v\u0103n b\u1ea3n c\u0169ng c\u1ea7n c\u1ed1 g\u1eafng hi\u1ec3n th\u1ecb c\u00e0ng s\u1edbm c\u00e0ng t\u1ed1t tr\u00ean trang, b\u00e0i vi\u1ebft n\u00e0y s\u1ebd h\u01b0\u1edbng d\u1eabn ch\u00fang ta c\u00e2n b\u1eb1ng c\u1ea3 2 y\u1ebfu t\u1ed1 n\u00e0y. OK, let&#8217;s go!<\/p>\n\n\n<p>C\u00e1c font th\u01b0\u1eddng l\u00e0 nh\u1eefng file l\u1edbn, v\u00e0 m\u1ea5t th\u1eddi gian \u0111\u1ec3 t\u1ea3i v\u1ec1. M\u1ed9t s\u1ed1 tr\u00ecnh duy\u1ec7t \u1ea9n v\u0103n b\u1ea3n cho \u0111\u1ebfn khi font t\u1ea3i xong th\u00ec m\u1edbi hi\u1ec3n th\u1ecb, \u0111\u00e2y l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra t\u00ecnh tr\u1ea1ng <a href=\"https:\/\/kiencang.net\/sua-loi-foit-trong-wordpress\/\" target=\"_blank\" rel=\"noreferrer noopener\">Flash of invisible text (FOIT \/ c\u00f3 th\u1ec3 d\u1ecbch l\u00e0: <em>Nh\u00e1y v\u0103n b\u1ea3n \u1ea9n<\/em> ho\u1eb7c <em>V\u0103n b\u1ea3n \u1ea9n xu\u1ea5t hi\u1ec7n \u0111\u1ed9t ng\u1ed9t<\/em>)<\/a>.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\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-6577d65e37267\" ><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-6577d65e37267\"  type=\"checkbox\" id=\"item-6577d65e37267\"><\/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\/dam-bao-van-ban-hien-thi\/#Cach_Lighthouse_kiem_tra_loi_hien_thi_font\" title=\"C\u00e1ch Lighthouse ki\u1ec3m tra l\u1ed7i hi\u1ec3n th\u1ecb font?\">C\u00e1ch Lighthouse ki\u1ec3m tra l\u1ed7i hi\u1ec3n th\u1ecb font?<\/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\/dam-bao-van-ban-hien-thi\/#Lam_the_nao_de_tranh_loi_van_ban_an\" title=\"L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 tr\u00e1nh l\u1ed7i v\u0103n b\u1ea3n \u1ea9n?\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 tr\u00e1nh l\u1ed7i v\u0103n b\u1ea3n \u1ea9n?<\/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\/dam-bao-van-ban-hien-thi\/#Google_fonts\" title=\"Google fonts\">Google fonts<\/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\/dam-bao-van-ban-hien-thi\/#Trinh_duyet_ho_tro\" title=\"Tr\u00ecnh duy\u1ec7t h\u1ed7 tr\u1ee3\">Tr\u00ecnh duy\u1ec7t h\u1ed7 tr\u1ee3<\/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\/dam-bao-van-ban-hien-thi\/#Vi_du_demo_trong_thuc_te\" title=\"V\u00ed d\u1ee5 demo trong th\u1ef1c t\u1ebf\">V\u00ed d\u1ee5 demo trong th\u1ef1c t\u1ebf<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\" id=\"cach-lighthouse-ki\u1ec3m-tra-l\u1ed7i-hi\u1ec3n-th\u1ecb-font\"><span class=\"ez-toc-section\" id=\"Cach_Lighthouse_kiem_tra_loi_hien_thi_font\"><\/span>C\u00e1ch Lighthouse ki\u1ec3m tra l\u1ed7i hi\u1ec3n th\u1ecb font?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Lighthouse g\u1eafn c\u1edd c\u1ea3nh b\u00e1o cho b\u1ea5t c\u1ee9 URL font n\u00e0o c\u00f3 th\u1ec3 l\u00e0 nguy\u00ean nh\u00e2n g\u00e2y ra hi\u1ec7n t\u01b0\u1ee3ng flash invisible text (nh\u00e1y v\u0103n b\u1ea3n \u1ea9n), v\u00ed d\u1ee5:<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/03\/font-display.png\" alt=\"l\u1ed7i hi\u1ec3n th\u1ecb font\" class=\"wp-image-15126\"\/><\/figure><\/div>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"lam-th\u1ebf-nao-d\u1ec3-tranh-l\u1ed7i-van-b\u1ea3n-\u1ea9n\"><span class=\"ez-toc-section\" id=\"Lam_the_nao_de_tranh_loi_van_ban_an\"><\/span>L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 tr\u00e1nh l\u1ed7i v\u0103n b\u1ea3n \u1ea9n?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>C\u00e1ch d\u1ec5 nh\u1ea5t \u0111\u1ec3 tr\u00e1nh hi\u1ec7n t\u01b0\u1ee3ng v\u0103n b\u1ea3n \u1ea9n trong kho\u1ea3ng th\u1eddi gian font t\u00f9y ch\u1ec9nh (custom font) t\u1ea3i v\u1ec1 \u0111\u00f3 l\u00e0 t\u1ea1m th\u1eddi hi\u1ec3n th\u1ecb font c\u00f3 s\u1eb5n c\u1ee7a h\u1ec7 th\u1ed1ng (system font- hay c\u00f2n g\u1ecdi l\u00e0 font an to\u00e0n, font c\u00f3 s\u1eb5n trong thi\u1ebft b\u1ecb c\u1ee7a ng\u01b0\u1eddi d\u00f9ng). B\u1eb1ng c\u00e1ch bao g\u1ed3m  CSS <code>font-display: swap<\/code> trong style <a href=\"https:\/\/kiencang.net\/nhung-font-web-font-face\/\" target=\"_blank\" rel=\"noreferrer noopener\">@font-face<\/a>, b\u1ea1n c\u00f3 th\u1ec3 tr\u00e1nh \u0111\u01b0\u1ee3c hi\u1ec7n t\u01b0\u1ee3ng FOIT trong h\u1ea7u h\u1ebft c\u00e1c tr\u00ecnh duy\u1ec7t hi\u1ec7n \u0111\u1ea1i, c\u1ee5 th\u1ec3:<\/p>\n\n\n<pre class=\"wp-block-code\"><code>@font-face {\n  font-family: 'Pacifico';\n  font-style: normal;\n  font-weight: 400;\n  src: local('Pacifico Regular'), local('Pacifico-Regular'), url(https:\/\/fonts.gstatic.com\/s\/pacifico\/v12\/FwZY7-Qmy14u9lezJ-6H6MmBp0u-.woff2) format('woff2');\n  font-display: swap;\n}<\/code><\/pre>\n\n\n<p><a href=\"https:\/\/developer.mozilla.org\/en-US\/docs\/Web\/CSS\/@font-face\/font-display\" target=\"_blank\" rel=\"noreferrer noopener\">API font-display<\/a> ch\u1ec9 \u0111\u1ecbnh cho c\u00e1ch font hi\u1ec3n th\u1ecb nh\u01b0 th\u1ebf n\u00e0o. <em>swap<\/em> n\u00f3i cho tr\u00ecnh duy\u1ec7t r\u1eb1ng v\u0103n b\u1ea3n s\u1eed d\u1ee5ng font t\u00f9y ch\u1ec9nh ph\u1ea3i hi\u1ec3n th\u1ecb ngay l\u1eadp t\u1ee9c, b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng font h\u1ec7 th\u1ed1ng n\u00e0o \u0111\u1ea5y. R\u1ed3i m\u1ed9t khi font t\u00f9y ch\u1ec9nh \u0111\u00e3 s\u1eb5n s\u00e0ng (t\u1ee9c l\u00e0 t\u1ea3i xong), n\u00f3 s\u1ebd thay th\u1ebf cho font h\u1ec7 th\u1ed1ng.<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"google-fonts\"><span class=\"ez-toc-section\" id=\"Google_fonts\"><\/span>Google fonts<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>Tr\u00ean Google fonts b\u1ea1n c\u1ea7n th\u00eam tham s\u1ed1 <code>&amp;display=swap<\/code> v\u00e0o cu\u1ed1i URL \u0111\u1ec3 n\u00f3 c\u00f3 \u0111\u01b0\u1ee3c t\u00ednh n\u0103ng swap, v\u00ed d\u1ee5:<\/p>\n\n\n<pre class=\"wp-block-code\"><code>&lt;link href=\"https:\/\/fonts.googleapis.com\/css?family=Roboto:400,700&amp;display=swap\" rel=\"stylesheet\"&gt;<\/code><\/pre>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"trinh-duy\u1ec7t-h\u1ed7-tr\u1ee3\"><span class=\"ez-toc-section\" id=\"Trinh_duyet_ho_tro\"><\/span>Tr\u00ecnh duy\u1ec7t h\u1ed7 tr\u1ee3<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>\u0110i\u1ec1u \u0111\u00e1ng n\u00f3i l\u00e0 kh\u00f4ng ph\u1ea3i t\u1ea5t c\u1ea3 c\u00e1c tr\u00ecnh duy\u1ec7t l\u1edbn \u0111\u1ec1u h\u1ed7 tr\u1ee3 <code>font-display: swap<\/code>, v\u00ec th\u1ebf b\u1ea1n c\u1ea7n t\u00ecm hi\u1ec3u th\u00eam m\u1ed9t ch\u00fat \u0111\u1ec3 s\u1eeda v\u1ea5n \u0111\u1ec1 v\u0103n b\u1ea3n \u1ea9n (c\u00f3 th\u1ec3 t\u00f4i s\u1ebd d\u1ecbch b\u00e0i n\u00e0y sau).<\/p>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<h2 class=\"wp-block-heading\" id=\"vi-d\u1ee5-demo-trong-th\u1ef1c-t\u1ebf\"><span class=\"ez-toc-section\" id=\"Vi_du_demo_trong_thuc_te\"><\/span>V\u00ed d\u1ee5 demo trong th\u1ef1c t\u1ebf<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n<p>T\u00f4i (ng\u01b0\u1eddi d\u1ecbch) c\u00f3 t\u1ea1o 2 trang demo \u0111\u1ec3 b\u1ea1n d\u1ec5 ki\u1ec3m tra v\u00e0 quan s\u00e1t:<\/p>\n\n\n<ul><li>Trang b\u1ecb g\u1eafn c\u1edd FOIT: <a href=\"https:\/\/static.kiencang.net\/2020\/demo-font-face.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/static.kiencang.net\/2020\/demo-font-face.html<\/a><\/li><li>Trang v\u01b0\u1ee3t qua b\u00e0i ki\u1ec3m tra FOIT (t\u1ee9c l\u00e0 t\u1ed1t h\u01a1n): <a href=\"https:\/\/static.kiencang.net\/2020\/font-face-anti-foit.html\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/static.kiencang.net\/2020\/font-face-anti-foit.html<\/a><\/li><\/ul>\n\n\n<p>Ki\u1ec3m tra b\u1eb1ng <a href=\"https:\/\/kiencang.net\/tang-toc-web-pagespeed-insights\/\" target=\"_blank\" rel=\"noreferrer noopener\">Google PageSpeed Insights<\/a> cho t\u1eebng trang tr\u00ean b\u1ea1n s\u1ebd th\u1ea5y k\u1ebft qu\u1ea3 t\u01b0\u01a1ng \u1ee9ng nh\u01b0 sau:<\/p>\n\n\n<p>Trang d\u00ednh FOIT:<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/trang-dinh-foit.png\" alt=\"trang b\u1ecb g\u1eafn c\u1edd c\u1ea3nh b\u00e1o FOIT\" class=\"wp-image-16038\"\/><\/figure><\/div>\n\n\n<p>\u0110i\u1ec3m s\u1ed1 t\u1ed1c \u0111\u1ed9:<\/p>\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/diem-so-font-face.png\" alt=\"\u0111i\u1ec3m s\u1ed1 t\u1ed1c \u0111\u1ed9 th\u1ea5p h\u01a1n\" class=\"wp-image-16040\"\/><\/figure>\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n<p>Trang v\u01b0\u1ee3t qua b\u00e0i ki\u1ec3m tra FOIT kh\u00f4ng b\u1ecb g\u1eafn c\u1ea3nh b\u00e1o n\u00e0y, \u0111i\u1ec3m s\u1ed1 t\u1ed1c \u0111\u1ed9 c\u1ee7a n\u00f3 c\u0169ng t\u1ed1t h\u01a1n:<\/p>\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2020\/04\/toc-do-anti-foit.png\" alt=\"\u0111i\u1ec3m s\u1ed1 t\u1ed1c \u0111\u1ed9 cao h\u01a1n\" class=\"wp-image-16041\"\/><\/figure><\/div>\n\n\n<p>Khi trang kh\u00f4ng b\u1ecb FOIT, n\u00f3 s\u1ebd hi\u1ec3n th\u1ecb font c\u00f3 s\u1eb5n tr\u00ean h\u1ec7 th\u1ed1ng tr\u01b0\u1edbc, r\u1ed3i m\u1edbi hi\u1ec3n th\u1ecb font t\u00f9y ch\u1ec9nh sau (khi n\u00f3 ho\u00e0n t\u1ea5t t\u1ea3i font t\u00f9y ch\u1ec9nh v\u1ec1):<\/p>\n\n\n<iframe loading=\"lazy\" width=\"640\" height=\"460\" src=\"https:\/\/www.youtube.com\/embed\/Ii1kC4OEwBk\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen=\"\"><\/iframe>\n\n\n<p><em>(D\u1ecbch t\u1eeb Ensure text remains visible during webfont load, trang web[.]dev)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>V\u00e0i l\u1eddi c\u1ee7a ng\u01b0\u1eddi d\u1ecbch: font t\u00f9y ch\u1ec9nh- khi s\u1eed d\u1ee5ng m\u1ed9t c\u00e1ch kh\u00e9o l\u00e9o, s\u1ebd gi\u00fap t\u0103ng t\u00ednh th\u1ea9m m\u1ef9, c\u00e1 t\u00ednh c\u1ee7a trang, v\u00e0 \u0111\u00f3 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u0111\u1ec3 thu h\u00fat ng\u01b0\u1eddi d\u00f9ng, ch\u00fang ta kh\u00f4ng n\u00ean c\u1ef1c \u0111oan lo\u1ea1i b\u1ecf n\u00f3 ch\u1ec9 \u0111\u1ec3 t\u1ed1c \u0111\u1ed9 t\u0103ng th\u00eam. Tuy nhi\u00ean, &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[268,282],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>\u0110\u1ea3m b\u1ea3o v\u0103n b\u1ea3n v\u1eabn hi\u1ec3n th\u1ecb trong khi font t\u00f9y ch\u1ec9nh t\u1ea3i v\u1ec1 &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"description\" content=\"Nhi\u1ec1u trang web s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng font t\u00f9y ch\u1ec9nh, n\u00f3 kh\u00f4ng ch\u1ec9 t\u1ea1o th\u00eam v\u1ea5n \u0111\u1ec1 v\u1ec1 s\u1ed1 l\u01b0\u1ee3ng k\u1ebft n\u1ed1i, dung l\u01b0\u1ee3ng m\u00e0 c\u00f2n c\u1ea3 hi\u1ec7n t\u01b0\u1ee3ng v\u0103n b\u1ea3n b\u1ecb \u1ea9n trong khi ph\u1ea3i ch\u1edd font t\u00f9y ch\u1ec9nh t\u1ea3i xong.\" \/>\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\/dam-bao-van-ban-hien-thi\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u0110\u1ea3m b\u1ea3o v\u0103n b\u1ea3n v\u1eabn hi\u1ec3n th\u1ecb trong khi font t\u00f9y ch\u1ec9nh t\u1ea3i v\u1ec1 &#8226; 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