{"id":4429,"date":"2026-02-27T11:51:50","date_gmt":"2026-02-27T04:51:50","guid":{"rendered":"https:\/\/wpdesign.vn\/rendering-contain-content-visibility-va-will-change\/"},"modified":"2026-05-04T17:11:13","modified_gmt":"2026-05-04T10:11:13","slug":"rendering-contain-content-visibility-va-will-change","status":"publish","type":"post","link":"https:\/\/wpdesign.vn\/vi\/rendering-contain-content-visibility-va-will-change\/","title":{"rendered":"Rendering: Contain, Content-Visibility V\u00e0 Will-Change"},"content":{"rendered":"\n<p>S\u1ef1 b\u00f9ng n\u1ed5 c\u1ee7a ki\u1ebfn tr\u00fac Single Page Application (SPA) \u0111\u00e3 \u0111\u1ea9y \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng (UI) l\u00ean m\u1ed9t t\u1ea7m cao m\u1edbi.<\/p>\n\n<h4 class=\"wp-block-heading\">1. CSS Containment: Thi\u1ebft l\u1eadp ranh gi\u1edbi c\u00f4 l\u1eadp<\/h4>\n\n<p><code>contain<\/code> kh\u00f4ng \u0111\u01a1n thu\u1ea7n l\u00e0 m\u1ed9t thu\u1ed9c t\u00ednh trang tr\u00ed n\u00f3 l\u00e0 m\u1ed9t &#8220;b\u1ee9c t\u01b0\u1eddng ng\u0103n ch\u00e1y&#8221; (firewall) v\u1ec1 m\u1eb7t logic layout.<\/p>\n\n<h6 class=\"wp-block-heading\">1.1. C\u00e1c gi\u00e1 tr\u1ecb n\u1ed9i t\u1ea1i v\u00e0 thu\u1eadt to\u00e1n x\u1eed l\u00fd<\/h6>\n\n<ul class=\"wp-block-list\">\n<li><strong><code>contain: size<\/code><\/strong>: Tr\u00ecnh duy\u1ec7t gi\u1ea3 \u0111\u1ecbnh ph\u1ea7n t\u1eed n\u00e0y c\u00f3 k\u00edch th\u01b0\u1edbc c\u1ed1 \u0111\u1ecbnh, n\u1ed9i dung b\u00ean trong kh\u00f4ng l\u00e0m thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc cha. \u0110i\u1ec1u n\u00e0y c\u1ef1c k\u1ef3 quan tr\u1ecdng trong vi\u1ec7c tr\u00e1nh &#8220;Layout Thrashing&#8221;. <\/li>\n\n\n\n<li><strong><code>contain: layout<\/code><\/strong>: \u0110\u00e2y l\u00e0 gi\u00e1 tr\u1ecb quy\u1ec1n n\u0103ng nh\u1ea5t. N\u00f3 t\u1ea1o ra m\u1ed9t <strong>Formatting Context<\/strong> \u0111\u1ed9c l\u1eadp. M\u1ecdi thay \u0111\u1ed5i v\u1ec1 v\u1ecb tr\u00ed c\u1ee7a ph\u1ea7n t\u1eed con s\u1ebd b\u1ecb &#8220;nh\u1ed1t&#8221; ho\u00e0n to\u00e0n trong bi\u00ean gi\u1edbi c\u1ee7a ph\u1ea7n t\u1eed cha. Tr\u00ecnh duy\u1ec7t s\u1ebd \u0111\u00e1nh d\u1ea5u nh\u00e1nh c\u00e2y DOM n\u00e0y l\u00e0 &#8220;m\u1ea1ch k\u00edn&#8221;.   <\/li>\n\n\n\n<li><strong><code>contain: paint<\/code><\/strong>: Ng\u0103n ch\u1eb7n c\u00e1c ph\u1ea7n t\u1eed con hi\u1ec3n th\u1ecb tr\u00e0n ra ngo\u00e0i bi\u00ean. N\u1ebfu m\u1ed9t ph\u1ea7n t\u1eed con n\u1eb1m ngo\u00e0i v\u00f9ng nh\u00ecn th\u1ea5y c\u1ee7a cha, n\u00f3 s\u1ebd kh\u00f4ng \u0111\u01b0\u1ee3c Rasterize (h\u00f3a \u0111i\u1ec3m \u1ea3nh), gi\u00fap ti\u1ebft ki\u1ec7m t\u00e0i nguy\u00ean GPU. <\/li>\n<\/ul>\n\n<h6 class=\"wp-block-heading\">1.2. Ph\u00e2n t\u00edch t\u00e1c \u0111\u1ed9ng l\u00ean Performance<\/h6>\n\n<p>Khi \u00e1p d\u1ee5ng <code>contain: strict<\/code>, b\u1ea1n \u0111ang chuy\u1ec3n t\u1eeb m\u00f4 h\u00ecnh &#8220;Global Update&#8221; sang &#8220;Local Update&#8221;. Trong c\u00e1c b\u00e0i \u0111o ki\u1ec3m th\u1ef1c t\u1ebf, v\u1edbi m\u1ed9t c\u00e2y DOM c\u00f3 10,000 nodes, vi\u1ec7c c\u00f4 l\u1eadp m\u1ed9t node cha gi\u00fap gi\u1ea3m th\u1eddi gian Layout t\u1eeb <strong>50ms xu\u1ed1ng c\u00f2n d\u01b0\u1edbi 1ms<\/strong>. <\/p>\n\n<h4 class=\"wp-block-heading\">2. Content-Visibility: K\u1ef9 thu\u1eadt Virtualization \u1edf t\u1ea7ng CSS<\/h4>\n\n<p>N\u1ebfu nh\u01b0 tr\u01b0\u1edbc \u0111\u00e2y, ch\u00fang ta ph\u1ea3i d\u00f9ng c\u00e1c th\u01b0 vi\u1ec7n JavaScript nh\u01b0 <code>react-window<\/code> \u0111\u1ec3 \u1ea9n c\u00e1c ph\u1ea7n t\u1eed ngo\u00e0i m\u00e0n h\u00ecnh, th\u00ec nay <code>content-visibility<\/code> cho ph\u00e9p tr\u00ecnh duy\u1ec7t t\u1ef1 \u0111\u1ed9ng h\u00f3a vi\u1ec7c n\u00e0y.<\/p>\n\n<h6 class=\"wp-block-heading\">2.1. Tr\u1ea1ng th\u00e1i <code>auto<\/code> v\u00e0 c\u01a1 ch\u1ebf &#8220;Skips&#8221;<\/h6>\n\n<p>Khi m\u1ed9t ph\u1ea7n t\u1eed c\u00f3 <code>content-visibility: auto<\/code>, tr\u00ecnh duy\u1ec7t s\u1ebd:<\/p>\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li>Ki\u1ec3m tra xem ph\u1ea7n t\u1eed c\u00f3 n\u1eb1m trong ho\u1eb7c g\u1ea7n Viewport kh\u00f4ng.<\/li>\n\n\n\n<li>N\u1ebfu kh\u00f4ng, n\u00f3 s\u1ebd \u00e1p d\u1ee5ng c\u01a1 ch\u1ebf &#8220;Skip Rendering&#8221;. To\u00e0n b\u1ed9 c\u00e2y DOM con v\u1eabn t\u1ed3n t\u1ea1i nh\u01b0ng kh\u00f4ng \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n Layout hay Paint. <\/li>\n\n\n\n<li>Khi ng\u01b0\u1eddi d\u00f9ng cu\u1ed9n t\u1edbi, tr\u00ecnh duy\u1ec7t m\u1edbi b\u1eaft \u0111\u1ea7u &#8220;\u0111\u1ed5 m\u1ef1c&#8221; v\u00e0o khung x\u01b0\u01a1ng \u0111\u00f3.<\/li>\n<\/ol>\n\n<h6 class=\"wp-block-heading\">2.2. Vai tr\u00f2 c\u1ee7a <code>contain-intrinsic-size<\/code><\/h6>\n\n<p>\u0110\u00e2y l\u00e0 ch\u00eca kh\u00f3a \u0111\u1ec3 b\u00e0i vi\u1ebft kh\u00f4ng b\u1ecb &#8220;gi\u1eadt&#8221; (Layout Shift). B\u1ea1n ph\u1ea3i khai b\u00e1o m\u1ed9t k\u00edch th\u01b0\u1edbc d\u1ef1 ph\u00f2ng (Placeholder) \u0111\u1ec3 tr\u00ecnh duy\u1ec7t bi\u1ebft ph\u1ea7n t\u1eed \u0111\u00f3 chi\u1ebfm bao nhi\u00eau kh\u00f4ng gian tr\u01b0\u1edbc khi n\u00f3 th\u1ef1c s\u1ef1 \u0111\u01b0\u1ee3c v\u1ebd ra. <\/p>\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>V\u00ed d\u1ee5:<\/strong> <code>contain-intrinsic-size: 0 500px;<\/code> b\u00e1o cho tr\u00ecnh duy\u1ec7t bi\u1ebft chi\u1ec1u cao d\u1ef1 ki\u1ebfn l\u00e0 500px.<\/p>\n<\/blockquote>\n\n<h4 class=\"wp-block-heading\">3. Will-Change: G\u1ee3i \u00fd t\u1ed1i \u01b0u h\u00f3a l\u1edbp (Layer)<\/h4>\n\n<p>Kh\u00e1c v\u1edbi hai c\u01a1 ch\u1ebf tr\u00ean t\u1eadp trung v\u00e0o Layout, <code>will-change<\/code> nh\u1eafm v\u00e0o giai \u0111o\u1ea1n <strong>Composite<\/strong> v\u00e0 <strong>GPU Acceleration<\/strong>.<\/p>\n\n<h6 class=\"wp-block-heading\">3.1. C\u01a1 ch\u1ebf Layer Promotion<\/h6>\n\n<p>Tr\u00ecnh duy\u1ec7t th\u00f4ng th\u01b0\u1eddng s\u1ebd v\u1ebd m\u1ecdi th\u1ee9 tr\u00ean m\u1ed9t l\u1edbp ph\u1eb3ng. Khi m\u1ed9t ph\u1ea7n t\u1eed thay \u0111\u1ed5i li\u00ean t\u1ee5c (nh\u01b0 animation), tr\u00ecnh duy\u1ec7t ph\u1ea3i &#8220;v\u1ebd l\u1ea1i&#8221; (Repaint) li\u00ean t\u1ee5c.  <code>will-change: transform<\/code> ra l\u1ec7nh cho tr\u00ecnh duy\u1ec7t: &#8220;H\u00e3y t\u00e1ch ph\u1ea7n t\u1eed n\u00e0y ra m\u1ed9t l\u1edbp ri\u00eang (Composited Layer) v\u00e0 \u0111\u1ea9y n\u00f3 l\u00ean GPU&#8221;.<\/p>\n\n<h6 class=\"wp-block-heading\">3.2. B\u00e0i to\u00e1n chi ph\u00ed b\u1ed9 nh\u1edb (The Memory Trade-off)<\/h6>\n\n<p>M\u1ed7i l\u1edbp (Layer) m\u1edbi ti\u00eau t\u1ed1n VRAM. N\u1ebfu b\u1ea1n \u00e1p d\u1ee5ng cho qu\u00e1 nhi\u1ec1u ph\u1ea7n t\u1eed, b\u1ed9 nh\u1edb \u0111\u1ed3 h\u1ecda s\u1ebd b\u1ecb tr\u00e0n, d\u1eabn \u0111\u1ebfn hi\u1ec7n t\u01b0\u1ee3ng tr\u00ecnh duy\u1ec7t b\u1ecb treo ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 s\u1eadp (Crash). \u0110\u00e2y l\u00e0 l\u00fd do t\u1ea1i sao <code>will-change<\/code> \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 &#8220;con dao hai l\u01b0\u1ee1i&#8221;.  <\/p>\n\n<h4 class=\"wp-block-heading\">4. B\u1ea3ng So S\u00e1nh Chuy\u00ean S\u00e2u (Technical Benchmarking)<\/h4>\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"624\" height=\"265\" src=\"https:\/\/wpdesign.vn\/wp-content\/uploads\/2026\/03\/screencapture-voiceinulsan-co-kr-2026-03-31-07_45_32.webpwp-content\/uploads\/2026\/02\/Capture1-4.jpg\" alt=\"\" class=\"wp-image-662\" srcset=\"https:\/\/wpdesign.vn\/wp-content\/uploads\/2026\/02\/Capture1-4.jpg 624w, https:\/\/wpdesign.vn\/wp-content\/uploads\/2026\/02\/Capture1-4-420x178.jpg 420w\" sizes=\"(max-width: 624px) 100vw, 624px\" \/><\/figure>\n\n<h6 class=\"wp-block-heading\">4.1. Ph\u00e2n t\u00edch \u0111\u1ecbnh l\u01b0\u1ee3ng (Quantitative Analysis)<\/h6>\n\n<p>\u0110\u1ec3 n\u1ed9i dung kh\u00f4ng b\u1ecb &#8220;thi\u1ebfu&#8221;, b\u1ea1n n\u00ean b\u1ed5 sung 3 lu\u1eadn \u0111i\u1ec3m ph\u00e2n t\u00edch d\u1ef1a tr\u00ean b\u1ea3ng tr\u00ean:<\/p>\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>V\u1ec1 kh\u1ea3 n\u0103ng chi\u1ebfm d\u1ee5ng b\u1ed9 nh\u1edb:<\/strong> Trong khi <code>contain<\/code> v\u00e0 <code>content-visibility<\/code> t\u1eadp trung v\u00e0o vi\u1ec7c <strong>ti\u1ebft ki\u1ec7m<\/strong> t\u00e0i nguy\u00ean b\u1eb1ng c\u00e1ch c\u1eaft t\u1ec9a nh\u1eefng t\u00ednh to\u00e1n kh\u00f4ng c\u1ea7n thi\u1ebft, th\u00ec <code>will-change<\/code> l\u1ea1i <strong>vay m\u01b0\u1ee3n<\/strong> t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng (GPU Memory) \u0111\u1ec3 \u0111\u1ed5i l\u1ea5y s\u1ef1 m\u01b0\u1ee3t m\u00e0. Vi\u1ec7c l\u1ea1m d\u1ee5ng <code>will-change<\/code> tr\u00ean thi\u1ebft b\u1ecb c\u1ea5u h\u00ecnh th\u1ea5p c\u00f3 th\u1ec3 g\u00e2y s\u1eadp tr\u00ecnh duy\u1ec7t do tr\u00e0n VRAM. <\/li>\n\n\n\n<li><strong>V\u1ec1 \u0111\u1ed9 tr\u1ec5 ph\u1ea3n h\u1ed3i (Interaction to Next Paint &#8211; INP):<\/strong> <code>contain<\/code> \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng nh\u1ea5t trong vi\u1ec7c gi\u1ea3m INP. Khi m\u1ed9t component \u0111\u01b0\u1ee3c c\u00f4 l\u1eadp, tr\u00ecnh duy\u1ec7t kh\u00f4ng ph\u1ea3i duy\u1ec7t l\u1ea1i to\u00e0n b\u1ed9 c\u00e2y DOM (DOM Tree Walking), gi\u00fap ph\u1ea3n h\u1ed3i c\u1ee7a UI di\u1ec5n ra g\u1ea7n nh\u01b0 t\u1ee9c th\u1eddi ngay c\u1ea3 khi trang c\u00f3 h\u00e0ng ch\u1ee5c ngh\u00ecn element. <\/li>\n\n\n\n<li><strong>V\u1ec1 h\u00e0nh vi c\u1ee7a Rendering Engine:<\/strong>\n<ul class=\"wp-block-list\">\n<li><strong>Containment<\/strong> ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng logic: N\u00f3 thay \u0111\u1ed5i c\u00e1ch thu\u1eadt to\u00e1n Layout v\u1eadn h\u00e0nh.<\/li>\n\n\n\n<li><strong>Content-visibility<\/strong> ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng hi\u1ec3n th\u1ecb: N\u00f3 l\u00e0 m\u1ed9t l\u1edbp &#8220;k\u00ednh l\u1ecdc&#8221; quy\u1ebft \u0111\u1ecbnh n\u1ed9i dung n\u00e0o \u0111\u01b0\u1ee3c x\u1eed l\u00fd.<\/li>\n\n\n\n<li><strong>Will-change<\/strong> ho\u1ea1t \u0111\u1ed9ng \u1edf t\u1ea7ng ph\u1ea7n c\u1ee9ng: N\u00f3 giao ti\u1ebfp tr\u1ef1c ti\u1ebfp v\u1edbi b\u1ed9 gi\u1ea3i m\u00e3 \u0111\u1ed3 h\u1ecda.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n<h6 class=\"wp-block-heading\">4.2. K\u1ecbch b\u1ea3n \u0111\u00e1nh gi\u00e1 nhanh (Quick Decision Matrix)<\/h6>\n\n<ul class=\"wp-block-list\">\n<li><strong>N\u1ebfu trang c\u1ee7a b\u1ea1n gi\u1eadt khi cu\u1ed9n:<\/strong> \u01afu ti\u00ean <code>content-visibility<\/code>.<\/li>\n\n\n\n<li><strong>N\u1ebfu thay \u0111\u1ed5i \u1edf widget n\u00e0y l\u00e0m widget kh\u00e1c lag:<\/strong> \u01afu ti\u00ean <code>contain<\/code>.<\/li>\n\n\n\n<li><strong>N\u1ebfu animation b\u1ecb kh\u1ef1ng l\u00fac m\u1edbi b\u1eaft \u0111\u1ea7u:<\/strong> \u01afu ti\u00ean <code>will-change<\/code>.<\/li>\n<\/ul>\n\n<h4 class=\"wp-block-heading\">5. K\u1ebft lu\u1eadn v\u00e0 Chi\u1ebfn l\u01b0\u1ee3c \u1ee9ng d\u1ee5ng (Best Practices)<\/h4>\n\n<p>\u0110\u1ec3 t\u1ed1i \u01b0u h\u00f3a m\u1ed9t \u1ee9ng d\u1ee5ng web c\u1ea5p doanh nghi\u1ec7p, b\u1ea1n kh\u00f4ng n\u00ean ch\u1ec9 ch\u1ecdn m\u1ed9t. H\u00e3y \u00e1p d\u1ee5ng chi\u1ebfn l\u01b0\u1ee3c k\u1ebft h\u1ee3p: <\/p>\n\n<ul class=\"wp-block-list\">\n<li>D\u00f9ng <strong>Containment<\/strong> cho c\u00e1c th\u00e0nh ph\u1ea7n UI \u0111\u1ed9c l\u1eadp (Cards, Modals).<\/li>\n\n\n\n<li>D\u00f9ng <strong>Content-Visibility<\/strong> cho c\u00e1c ph\u1ea7n n\u1ed9i dung d\u00e0i, c\u00e1c comment section \u1edf d\u01b0\u1edbi trang.<\/li>\n\n\n\n<li>D\u00f9ng <strong>Will-Change<\/strong> m\u1ed9t c\u00e1ch ti\u1ebft ki\u1ec7m, ch\u1ec9 d\u00e0nh cho c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng \u0111ang t\u01b0\u01a1ng t\u00e1c ho\u1eb7c s\u1eafp ch\u1ea1y animation n\u1eb7ng.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ef1 b\u00f9ng n\u1ed5 c\u1ee7a ki\u1ebfn tr\u00fac Single Page Application (SPA) \u0111\u00e3 \u0111\u1ea9y \u0111\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":4428,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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