{"id":4490,"date":"2026-01-27T16:49:48","date_gmt":"2026-01-27T09:49:48","guid":{"rendered":"https:\/\/wpdesign.vn\/css-position-phan-biet-va-ung-dung-trong-thiet-ke-giao-dien\/"},"modified":"2026-05-05T15:19:25","modified_gmt":"2026-05-05T08:19:25","slug":"css-position-phan-biet-va-ung-dung-trong-thiet-ke-giao-dien","status":"publish","type":"post","link":"https:\/\/wpdesign.vn\/vi\/css-position-phan-biet-va-ung-dung-trong-thiet-ke-giao-dien\/","title":{"rendered":"CSS Position Ph\u00e2n Bi\u1ec7t v\u00e0 \u1ee8ng D\u1ee5ng Trong Thi\u1ebft K\u1ebf Giao Di\u1ec7n"},"content":{"rendered":"\n<p>Trong thi\u1ebft k\u1ebf giao di\u1ec7n, thu\u1ed9c t\u00ednh <code>position<\/code> \u0111\u00f3ng vai tr\u00f2 \u0111i\u1ec1u h\u01b0\u1edbng c\u00e1ch c\u00e1c ph\u1ea7n t\u1eed t\u01b0\u01a1ng t\u00e1c v\u1edbi lu\u1ed3ng t\u00e0i li\u1ec7u (document flow). Vi\u1ec7c hi\u1ec3u r\u00f5 b\u1ea3n ch\u1ea5t c\u1ee7a t\u1eebng gi\u00e1 tr\u1ecb kh\u00f4ng ch\u1ec9 gi\u00fap b\u1ea1n ki\u1ec3m so\u00e1t b\u1ed1 c\u1ee5c m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c m\u00e0 c\u00f2n \u0111\u1ea3m b\u1ea3o t\u00ednh \u1ed5n \u0111\u1ecbnh c\u1ee7a giao di\u1ec7n tr\u00ean nhi\u1ec1u thi\u1ebft b\u1ecb. <\/p>\n\n<h4 class=\"wp-block-heading\">1. Position: Relative<\/h4>\n\n<p><code>Position: relative<\/code> cho ph\u00e9p d\u1ecbch chuy\u1ec3n ph\u1ea7n t\u1eed d\u1ef1a tr\u00ean v\u1ecb tr\u00ed g\u1ed1c c\u1ee7a ch\u00ednh n\u00f3 m\u00e0 kh\u00f4ng ph\u00e1 v\u1ee1 c\u1ea5u tr\u00fac t\u1ed5ng th\u1ec3.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m:<\/strong> Ph\u1ea7n t\u1eed v\u1eabn chi\u1ebfm kh\u00f4ng gian ban \u0111\u1ea7u trong lu\u1ed3ng t\u00e0i li\u1ec7u (normal flow). C\u00e1c ph\u1ea7n t\u1eed xung quanh s\u1ebd kh\u00f4ng t\u1ef1 \u0111\u1ed9ng l\u1ea5p \u0111\u1ea7y kho\u1ea3ng tr\u1ed1ng hay b\u1ecb x\u00f4 l\u1ec7ch khi ph\u1ea7n t\u1eed n\u00e0y di chuy\u1ec3n. <\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng:<\/strong> C\u0103n ch\u1ec9nh v\u1ecb tr\u00ed \u1edf m\u1ee9c \u0111\u1ed9 tinh t\u1ebf (pixel-perfect) m\u00e0 kh\u00f4ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn c\u00e1c th\u00e0nh ph\u1ea7n l\u00e2n c\u1eadn.<\/li>\n<\/ul>\n\n<h4 class=\"wp-block-heading\">2. Position: Absolute<\/h4>\n\n<p><code>Position: absolute<\/code> t\u00e1ch bi\u1ec7t ho\u00e0n to\u00e0n ph\u1ea7n t\u1eed kh\u1ecfi lu\u1ed3ng t\u00e0i li\u1ec7u th\u00f4ng th\u01b0\u1eddng, cho ph\u00e9p t\u1ef1 do \u0111\u1ecbnh v\u1ecb trong m\u1ed9t kh\u00f4ng gian ri\u00eang bi\u1ec7t.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m:<\/strong> Ph\u1ea7n t\u1eed kh\u00f4ng c\u00f2n chi\u1ebfm kh\u00f4ng gian v\u1eadt l\u00fd trong b\u1ed1 c\u1ee5c; c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c s\u1ebd t\u1ef1 \u0111\u1ed9ng l\u1ea5p \u0111\u1ea7y kho\u1ea3ng tr\u1ed1ng nh\u01b0 th\u1ec3 ph\u1ea7n t\u1eed n\u00e0y kh\u00f4ng t\u1ed3n t\u1ea1i.<\/li>\n\n\n\n<li><strong>C\u01a1 ch\u1ebf \u0111\u1ecbnh v\u1ecb:<\/strong> V\u1ecb tr\u00ed c\u1ee7a ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n d\u1ef1a tr\u00ean <strong>kh\u1ed1i ch\u1ee9a (Containing Block)<\/strong> g\u1ea7n nh\u1ea5t c\u00f3 <code>position<\/code> kh\u00e1c <code>static<\/code>. N\u1ebfu kh\u00f4ng t\u00ecm th\u1ea5y m\u1ed1c n\u00e0y, n\u00f3 s\u1ebd l\u1ea5y khung h\u00ecnh tr\u00ecnh duy\u1ec7t (Viewport) l\u00e0m chu\u1ea9n. <\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng:<\/strong> T\u1ea1o c\u00e1c th\u00e0nh ph\u1ea7n l\u1edbp ch\u1ed3ng (Layers) nh\u01b0: nh\u00e3n th\u00f4ng b\u00e1o (Badge), n\u00fat \u0111\u00f3ng (Close button) tr\u00ean Modal.<\/li>\n<\/ul>\n\n<h4 class=\"wp-block-heading\">3. Position: Fixed<\/h4>\n\n<p><code>Position: fixed<\/code> c\u1ed1 \u0111\u1ecbnh ph\u1ea7n t\u1eed tr\u1ef1c ti\u1ebfp v\u00e0o khung nh\u00ecn c\u1ee7a tr\u00ecnh duy\u1ec7t, gi\u1eef cho th\u00e0nh ph\u1ea7n \u0111\u00f3 lu\u00f4n hi\u1ec7n di\u1ec7n b\u1ea5t k\u1ec3 h\u00e0nh \u0111\u1ed9ng cu\u1ed9n trang.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m:<\/strong> T\u01b0\u01a1ng t\u1ef1 nh\u01b0 <code>absolute<\/code>, ph\u1ea7n t\u1eed <code>fixed<\/code> \u0111\u01b0\u1ee3c t\u00e1ch kh\u1ecfi lu\u1ed3ng t\u00e0i li\u1ec7u v\u00e0 kh\u00f4ng chi\u1ebfm kh\u00f4ng gian. Tuy nhi\u00ean, m\u1ed1c tham chi\u1ebfu c\u1ee7a n\u00f3 l\u00e0 <strong>Viewport<\/strong> (khung h\u00ecnh tr\u00ecnh duy\u1ec7t), do \u0111\u00f3 v\u1ecb tr\u00ed c\u1ee7a n\u00f3 s\u1ebd kh\u00f4ng thay \u0111\u1ed5i khi ng\u01b0\u1eddi d\u00f9ng cu\u1ed9n chu\u1ed9t. <\/li>\n\n\n\n<li><strong>C\u01a1 ch\u1ebf:<\/strong> Ph\u1ea7n t\u1eed \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n v\u1ecb tr\u00ed d\u1ef1a tr\u00ean c\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o t\u00ednh kh\u1ea3 d\u1ee5ng c\u1ee7a c\u00e1c c\u00f4ng c\u1ee5 \u0111i\u1ec1u h\u01b0\u1edbng ho\u1eb7c h\u1ed7 tr\u1ee3 kh\u00e1ch h\u00e0ng trong su\u1ed1t qu\u00e1 tr\u00ecnh duy\u1ec7t web. <\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng:<\/strong> C\u00e1c thanh \u0111i\u1ec1u h\u01b0\u1edbng ch\u00ednh (Global Header).<\/li>\n<\/ul>\n\n<h4 class=\"wp-block-heading\">4. Position: Sticky<\/h4>\n\n<p><code class=\"\">Position: sticky<\/code> l\u00e0 gi\u1ea3i ph\u00e1p lai gi\u1eefa <code class=\"\">relative<\/code> v\u00e0 <code class=\"\">fixed<\/code>, cho ph\u00e9p ph\u1ea7n t\u1eed chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i linh ho\u1ea1t theo h\u00e0nh vi cu\u1ed9n c\u1ee7a ng\u01b0\u1eddi d\u00f9ng.<\/p>\n\n<ul class=\"wp-block-list\">\n<li><strong>C\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng:<\/strong> \u1ede tr\u1ea1ng th\u00e1i b\u00ecnh th\u01b0\u1eddng, ph\u1ea7n t\u1eed tu\u00e2n th\u1ee7 lu\u1ed3ng t\u00e0i li\u1ec7u. Tuy nhi\u00ean, khi v\u1ecb tr\u00ed cu\u1ed9n \u0111\u1ea1t t\u1edbi ng\u01b0\u1ee1ng x\u00e1c \u0111\u1ecbnh (threshold), ph\u1ea7n t\u1eed s\u1ebd t\u1ef1 \u0111\u1ed9ng chuy\u1ec3n sang ch\u1ebf \u0111\u1ed9 c\u1ed1 \u0111\u1ecbnh trong ph\u1ea1m vi c\u1ee7a kh\u1ed1i cha. <\/li>\n\n\n\n<li><strong>\u0110\u1eb7c \u0111i\u1ec3m quan tr\u1ecdng:<\/strong> Kh\u00e1c v\u1edbi <code>fixed<\/code>, ph\u1ea7n t\u1eed <code>sticky<\/code> b\u1ecb gi\u1edbi h\u1ea1n b\u1edfi kh\u00f4ng gian c\u1ee7a kh\u1ed1i ch\u1ee9a tr\u1ef1c ti\u1ebfp. N\u00f3 s\u1ebd ch\u1ec9 &#8220;d\u00ednh&#8221; trong khu v\u1ef1c c\u1ee7a cha v\u00e0 s\u1ebd ti\u1ebfp t\u1ee5c tr\u00f4i \u0111i khi kh\u1ed1i cha n\u00e0y \u0111\u00e3 \u0111\u01b0\u1ee3c cu\u1ed9n qua h\u1ebft. <\/li>\n\n\n\n<li><strong>\u1ee8ng d\u1ee5ng:<\/strong> Duy tr\u00ec ti\u00eau \u0111\u1ec1 m\u1ee5c (Table Headers) ho\u1eb7c danh m\u1ee5c khi ng\u01b0\u1eddi d\u00f9ng \u0111\u1ecdc c\u00e1c b\u00e0i vi\u1ebft d\u00e0i.<\/li>\n<\/ul>\n\n<p><strong>T\u00f3m t\u1eaft nhanh \u0111\u1ec3 ch\u1ecdn l\u1ef1a:<\/strong><\/p>\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"497\" height=\"124\" src=\"https:\/\/wpdesign.vn\/wp-content\/uploads\/2026\/03\/screencapture-voiceinulsan-co-kr-2026-03-31-07_45_32.webpwp-content\/uploads\/2026\/01\/Capture1-4.jpg\" alt=\"\" class=\"wp-image-555\" srcset=\"https:\/\/wpdesign.vn\/wp-content\/uploads\/2026\/01\/Capture1-4.jpg 497w, https:\/\/wpdesign.vn\/wp-content\/uploads\/2026\/01\/Capture1-4-420x105.jpg 420w\" sizes=\"(max-width: 497px) 100vw, 497px\" \/><\/figure>\n\n<h4 class=\"wp-block-heading\">5. C\u00e1c l\u1ed7i th\u1ef1c thi ph\u1ed5 bi\u1ebfn v\u00e0 c\u00e1ch x\u1eed l\u00fd<\/h4>\n\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 3 l\u1ed7i k\u1ef9 thu\u1eadt th\u01b0\u1eddng g\u1eb7p khi\u1ebfn thu\u1ed9c t\u00ednh <code>position<\/code> kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng nh\u01b0 mong \u0111\u1ee3i:<\/p>\n\n<h6 class=\"wp-block-heading\">Sai l\u1ec7ch ng\u1eef c\u1ea3nh \u0111\u1ecbnh v\u1ecb (Missing Positioning Context)<\/h6>\n\n<ul class=\"wp-block-list\">\n<li><strong>V\u1ea5n \u0111\u1ec1:<\/strong> Ph\u1ea7n t\u1eed <code>absolute<\/code> kh\u00f4ng b\u00e1m theo kh\u1ed1i cha m\u00e0 bay ra r\u00eca m\u00e0n h\u00ecnh ho\u1eb7c b\u00e1m theo th\u1ebb <code>body<\/code>.<\/li>\n\n\n\n<li><strong>Nguy\u00ean nh\u00e2n:<\/strong> Ph\u1ea7n t\u1eed cha ch\u01b0a \u0111\u01b0\u1ee3c x\u00e1c l\u1eadp ng\u1eef c\u1ea3nh \u0111\u1ecbnh v\u1ecb (m\u1eb7c \u0111\u1ecbnh l\u00e0 <code>static<\/code>).<\/li>\n\n\n\n<li><strong>Gi\u1ea3i ph\u00e1p:<\/strong> Thi\u1ebft l\u1eadp <code>position: relative<\/code> (ho\u1eb7c b\u1ea5t k\u1ef3 gi\u00e1 tr\u1ecb n\u00e0o kh\u00e1c <code>static<\/code>) cho ph\u1ea7n t\u1eed cha g\u1ea7n nh\u1ea5t \u0111\u1ec3 t\u1ea1o m\u1ed1c t\u1ecda \u0111\u1ed9 cho ph\u1ea7n t\u1eed con.<\/li>\n<\/ul>\n\n<h6 class=\"wp-block-heading\">Xung \u0111\u1ed9t thu\u1ed9c t\u00ednh Overflow (Sticky Container Issue)<\/h6>\n\n<ul class=\"wp-block-list\">\n<li><strong>V\u1ea5n \u0111\u1ec1:<\/strong> <code>position: sticky<\/code> kh\u00f4ng th\u1ec3 &#8220;d\u00ednh&#8221; khi cu\u1ed9n trang d\u00f9 \u0111\u00e3 thi\u1ebft l\u1eadp t\u1ecda \u0111\u1ed9.<\/li>\n\n\n\n<li><strong>Nguy\u00ean nh\u00e2n:<\/strong> M\u1ed9t trong c\u00e1c ph\u1ea7n t\u1eed cha c\u1ee7a n\u00f3 \u0111ang c\u00f3 thu\u1ed9c t\u00ednh <code>overflow: hidden<\/code>, <code>auto<\/code> ho\u1eb7c <code>scroll<\/code>. \u0110i\u1ec1u n\u00e0y l\u00e0m tri\u1ec7t ti\u00eau kh\u1ea3 n\u0103ng t\u00ednh to\u00e1n v\u1ecb tr\u00ed d\u1ef1a tr\u00ean khung nh\u00ecn c\u1ee7a <code>sticky<\/code>. <\/li>\n\n\n\n<li><strong>Gi\u1ea3i ph\u00e1p:<\/strong> Ki\u1ec3m tra v\u00e0 lo\u1ea1i b\u1ecf <code>overflow<\/code> \u1edf c\u00e1c c\u1ea5p cha, ho\u1eb7c \u0111\u1ea3m b\u1ea3o kh\u1ed1i cha tr\u1ef1c ti\u1ebfp c\u1ee7a ph\u1ea7n t\u1eed sticky c\u00f3 \u0111\u1ee7 chi\u1ec1u cao \u0111\u1ec3 n\u00f3 th\u1ef1c hi\u1ec7n h\u00e0nh \u0111\u1ed9ng tr\u01b0\u1ee3t.<\/li>\n<\/ul>\n\n<h6 class=\"wp-block-heading\">Thi\u1ebfu thu\u1ed9c t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng (Directional Properties)<\/h6>\n\n<ul class=\"wp-block-list\">\n<li><strong>V\u1ea5n \u0111\u1ec1:<\/strong> Ph\u1ea7n t\u1eed <code>absolute<\/code>, <code>fixed<\/code> ho\u1eb7c <code>sticky<\/code> n\u1eb1m sai ch\u1ed7 ho\u1eb7c kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng.<\/li>\n\n\n\n<li><strong>Nguy\u00ean nh\u00e2n:<\/strong> Qu\u00ean khai b\u00e1o c\u00e1c thu\u1ed9c t\u00ednh t\u1ecda \u0111\u1ed9 (<code>top<\/code>, <code>bottom<\/code>, <code>left<\/code>, <code>right<\/code>). N\u1ebfu kh\u00f4ng c\u00f3 c\u00e1c gi\u00e1 tr\u1ecb n\u00e0y, tr\u00ecnh duy\u1ec7t s\u1ebd gi\u1eef ph\u1ea7n t\u1eed \u1edf v\u1ecb tr\u00ed m\u1eb7c \u0111\u1ecbnh ban \u0111\u1ea7u trong lu\u1ed3ng t\u00e0i li\u1ec7u. <\/li>\n\n\n\n<li><strong>Gi\u1ea3i ph\u00e1p:<\/strong> Lu\u00f4n \u0111i k\u00e8m \u00edt nh\u1ea5t m\u1ed9t thu\u1ed9c t\u00ednh \u0111\u1ecbnh h\u01b0\u1edbng (v\u00ed d\u1ee5: <code>top: 0<\/code>) \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh \u0111i\u1ec3m d\u1eebng ho\u1eb7c \u0111i\u1ec3m b\u00e1m c\u1ee7a ph\u1ea7n t\u1eed.<\/li>\n<\/ul>\n\n<p><strong>K\u1ebft lu\u1eadn<\/strong>: H\u00e3y d\u00f9ng <code>relative<\/code> \u0111\u1ec3 l\u00e0m m\u1ed1c, <code>absolute<\/code> \u0111\u1ec3 trang tr\u00ed ch\u1ed3ng l\u1edbp, <code>fixed<\/code> cho nh\u1eefng th\u1ee9 quan tr\u1ecdng c\u1ea7n th\u1ea5y ngay, v\u00e0 <code>sticky<\/code> \u0111\u1ec3 gi\u1eef ch\u00e2n ng\u01b0\u1eddi d\u00f9ng khi \u0111\u1ecdc n\u1ed9i dung d\u00e0i.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Trong thi\u1ebft k\u1ebf giao di\u1ec7n, thu\u1ed9c t\u00ednh position \u0111\u00f3ng vai tr\u00f2 \u0111i\u1ec1u h\u01b0\u1edbng c\u00e1ch c\u00e1c ph\u1ea7n t\u1eed t\u01b0\u01a1ng t\u00e1c v\u1edbi [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":4489,"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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