{"id":49905,"date":"2023-12-17T05:05:45","date_gmt":"2023-12-17T05:05:45","guid":{"rendered":"https:\/\/masterskills.org\/blog\/top-20-cau-hoi-phong-van-html-css-hay-gap-nhat.html"},"modified":"2023-12-17T05:05:45","modified_gmt":"2023-12-17T05:05:45","slug":"top-20-cau-hoi-phong-van-html-css-hay-gap-nhat","status":"publish","type":"post","link":"https:\/\/masterskills.org\/blog\/top-20-cau-hoi-phong-van-html-css-hay-gap-nhat.html","title":{"rendered":"Top 20+ C\u00e2u H\u1ecfi Ph\u1ecfng V\u1ea5n HTML CSS Hay G\u1eb7p Nh\u1ea5t"},"content":{"rendered":"
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L\u1eadp tr\u00ecnh vi\u00ean HTML CSS lu\u00f4n c\u00f3 nhu c\u1ea7u r\u1ea5t cao tr\u00ean th\u1ecb tr\u01b0\u1eddng vi\u1ec7c l\u00e0m. Khi chu\u1ea9n b\u1ecb cho m\u1ed9t cu\u1ed9c ph\u1ecfng v\u1ea5n HTML CSS, \u0111i\u1ec1u c\u1ea7n thi\u1ebft l\u00e0 trang b\u1ecb cho m\u00ecnh nh\u1eefng ki\u1ebfn th\u1ee9c v\u00e0 k\u1ef9 n\u0103ng c\u1ea7n thi\u1ebft. Th\u00f4ng qua b\u00e0i vi\u1ebft d\u01b0\u1edbi \u0111\u00e2y, Masterskills s\u1ebd g\u1eedi \u0111\u1ebfn b\u1ea1n top 20+ c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n HTML CSS<\/strong> hay g\u1eb7p nh\u1ea5t c\u00f9ng v\u1edbi m\u1ed9t s\u1ed1 g\u1ee3i \u00fd tr\u1ea3 l\u1eddi gi\u00fap b\u1ea1n c\u00f3 \u0111\u01b0\u1ee3c s\u1ef1 chu\u1ea9n b\u1ecb t\u1ed1t nh\u1ea5t cho bu\u1ed5i ph\u1ecfng v\u1ea5n s\u1eafp t\u1edbi!\u00a0<\/p>\n

C\u1ea7n chu\u1ea9n b\u1ecb nh\u1eefng g\u00ec cho ph\u1ecfng v\u1ea5n HTML CSS?\u00a0<\/strong><\/h2>\n

Tr\u01b0\u1edbc khi t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n HTML CSS <\/strong>ph\u1ed5 bi\u1ebfn, h\u00e3y c\u00f9ng Masterskills s\u01a1 l\u01b0\u1ee3c v\u1ec1 nh\u1eefng \u0111i\u1ec1u quan tr\u1ecdng c\u1ea7n chu\u1ea9n b\u1ecb:<\/p>\n

T\u00ecm hi\u1ec3u v\u1ec1 v\u1ecb tr\u00ed c\u00f4ng vi\u1ec7c v\u00e0 y\u00eau c\u1ea7u k\u1ef9 n\u0103ng\u00a0<\/strong><\/h3>\n

Tr\u01b0\u1edbc khi tham d\u1ef1 cu\u1ed9c ph\u1ecfng v\u1ea5n, b\u1ea1n n\u00ean l\u00e0m quen v\u1edbi v\u1ecb tr\u00ed c\u00f4ng vi\u1ec7c v\u00e0 c\u00e1c k\u1ef9 n\u0103ng c\u1ea7n thi\u1ebft. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u1ea1n hi\u1ec3u r\u00f5 vai tr\u00f2 \u0111\u00f2i h\u1ecfi nh\u1eefng g\u00ec v\u00e0 gi\u00fap b\u1ea1n \u0111i\u1ec1u ch\u1ec9nh ki\u1ebfn th\u1ee9c v\u00e0 chuy\u00ean m\u00f4n c\u1ee7a m\u00ecnh cho ph\u00f9 h\u1ee3p.<\/p>\n

N\u1eafm v\u1eefng ki\u1ebfn th\u1ee9c v\u1ec1 HTML v\u00e0 CSS\u00a0<\/strong><\/h3>\n

HTML v\u00e0 CSS l\u00e0 c\u00e1c block x\u00e2y d\u1ef1ng c\u01a1 b\u1ea3n c\u1ee7a ph\u00e1t tri\u1ec3n web. \u0110i\u1ec1u b\u1eaft bu\u1ed9c l\u00e0 ph\u1ea3i th\u00f4ng th\u1ea1o c\u00e1c ng\u00f4n ng\u1eef n\u00e0y tr\u01b0\u1edbc khi b\u01b0\u1edbc v\u00e0o m\u1ed9t cu\u1ed9c ph\u1ecfng v\u1ea5n. \u0110\u1ec3 n\u00e2ng cao t\u1ec9 l\u1ec7 th\u00e0nh c\u00f4ng, h\u00e3y \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea1n \u0111\u00e3 th\u00f4ng th\u1ea1o c\u00e1c th\u1ebb HTML, component, b\u1ed9 ch\u1ecdn v\u00e0 thu\u1ed9c t\u00ednh CSS.<\/p>\n

Chu\u1ea9n b\u1ecb tr\u01b0\u1edbc danh s\u00e1ch c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n\u00a0<\/strong><\/h3>\n

\u0110\u1ec3 \u0111\u1ea3m b\u1ea3o m\u1ed9t cu\u1ed9c ph\u1ecfng v\u1ea5n th\u00e0nh c\u00f4ng, \u0111i\u1ec1u c\u1ea7n thi\u1ebft l\u00e0 chu\u1ea9n b\u1ecb m\u1ed9t danh s\u00e1ch \u0111\u1ea7y \u0111\u1ee7 c\u00e1c c\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n HTML CSS th\u01b0\u1eddng g\u1eb7p. \u0110i\u1ec1u n\u00e0y s\u1ebd gi\u00fap b\u1ea1n s\u1eafp x\u1ebfp suy ngh\u0129 c\u1ee7a m\u00ecnh v\u00e0 s\u1eb5n s\u00e0ng \u0111\u01b0a ra c\u00e2u tr\u1ea3 l\u1eddi ng\u1eafn g\u1ecdn v\u00e0 ch\u00ednh x\u00e1c khi c\u1ea7n thi\u1ebft.<\/p>\n

\"c\u00e2u
Chu\u1ea9n b\u1ecb tr\u01b0\u1edbc cho cu\u1ed9c ph\u1ecfng v\u1ea5n<\/figcaption><\/figure>\n

C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n HTML CSS th\u01b0\u1eddng g\u1eb7p\u00a0<\/strong><\/h2>\n

C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n HTML CSS d\u00e0nh cho fresher\u00a0<\/strong><\/h3>\n

1. HTML l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

HTML l\u00e0 vi\u1ebft t\u1eaft c\u1ee7a Ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n. N\u00f3 l\u00e0 ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u ti\u00eau chu\u1ea9n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o c\u1ea5u tr\u00fac v\u00e0 n\u1ed9i dung c\u1ee7a c\u00e1c trang web. HTML s\u1eed d\u1ee5ng c\u00e1c th\u1ebb \u0111\u1ec3 \u0111\u00e1nh d\u1ea5u c\u00e1c th\u00e0nh ph\u1ea7n trong t\u00e0i li\u1ec7u v\u00e0 ch\u1ec9 \u0111\u1ecbnh c\u00e1ch ch\u00fang s\u1ebd \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb trong tr\u00ecnh duy\u1ec7t web.<\/p>\n

2. HTML tags l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

HTML tags l\u00e0 c\u00e1c block x\u00e2y d\u1ef1ng c\u1ee7a m\u1ed9t t\u00e0i li\u1ec7u HTML. Ch\u00fang x\u00e1c \u0111\u1ecbnh c\u1ea5u tr\u00fac v\u00e0 \u0111\u1ecbnh d\u1ea1ng c\u1ee7a n\u1ed9i dung trong m\u1ed9t trang web. C\u00e1c th\u1ebb \u0111\u01b0\u1ee3c \u0111\u1eb7t trong d\u1ea5u ngo\u1eb7c nh\u1ecdn (<>) v\u00e0 th\u01b0\u1eddng \u0111i theo c\u1eb7p, v\u1edbi th\u1ebb m\u1edf v\u00e0 th\u1ebb \u0111\u00f3ng.<\/p>\n

3. X\u00e1c \u0111\u1ecbnh c\u00e1c lo\u1ea1i danh s\u00e1ch trong HTML.\u00a0<\/strong><\/h4>\n

HTML h\u1ed7 tr\u1ee3 ba lo\u1ea1i danh s\u00e1ch: danh s\u00e1ch c\u00f3 th\u1ee9 t\u1ef1, danh s\u00e1ch kh\u00f4ng c\u00f3 th\u1ee9 t\u1ef1 v\u00e0 danh s\u00e1ch \u0111\u1ecbnh ngh\u0129a. C\u1ee5 th\u1ec3:<\/p>\n

    \n
  • Danh s\u00e1ch c\u00f3 th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng th\u1ebb <ol> v\u00e0 hi\u1ec3n th\u1ecb danh s\u00e1ch \u0111\u01b0\u1ee3c \u0111\u00e1nh s\u1ed1.<\/li>\n
  • Danh s\u00e1ch kh\u00f4ng c\u00f3 th\u1ee9 t\u1ef1 \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng th\u1ebb <ul> v\u00e0 hi\u1ec3n th\u1ecb danh s\u00e1ch c\u00f3 d\u1ea5u \u0111\u1ea7u d\u00f2ng.<\/li>\n
  • Danh s\u00e1ch \u0111\u1ecbnh ngh\u0129a \u0111\u01b0\u1ee3c t\u1ea1o b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng th\u1ebb <dl> v\u00e0 bao g\u1ed3m m\u1ed9t lo\u1ea1t c\u00e1c thu\u1eadt ng\u1eef v\u00e0 \u0111\u1ecbnh ngh\u0129a t\u01b0\u01a1ng \u1ee9ng c\u1ee7a ch\u00fang, \u0111\u01b0\u1ee3c \u0111\u00e1nh d\u1ea5u b\u1eb1ng c\u00e1c th\u1ebb <dt> v\u00e0 <dd> t\u01b0\u01a1ng \u1ee9ng.<\/li>\n<\/ul>\n

    4. Element trong HTML l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

    Trong HTML, Element hay m\u1ed9t ph\u1ea7n t\u1eed \u0111\u1ea1i di\u1ec7n cho m\u1ed9t ph\u1ea7n ri\u00eang bi\u1ec7t c\u1ee7a t\u00e0i li\u1ec7u v\u00e0 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi m\u1ed9t c\u1eb7p th\u1ebb. C\u00e1c ph\u1ea7n t\u1eed c\u00f3 th\u1ec3 ch\u1ee9a v\u0103n b\u1ea3n, c\u00e1c ph\u1ea7n t\u1eed kh\u00e1c ho\u1eb7c c\u1ea3 hai. M\u1ed7i y\u1ebfu t\u1ed1 c\u00f3 m\u1ed9t m\u1ee5c \u0111\u00edch c\u1ee5 th\u1ec3 v\u00e0 cung c\u1ea5p c\u1ea5u tr\u00fac c\u0169ng nh\u01b0 \u00fd ngh\u0129a cho n\u1ed9i dung trong m\u1ed9t trang web.<\/p>\n

    5. S\u1ef1 kh\u00e1c nhau gi\u1eefa HTML v\u00e0 CSS l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

    HTML v\u00e0 CSS \u0111\u1ec1u c\u1ea7n thi\u1ebft cho ph\u00e1t tri\u1ec3n web nh\u01b0ng ph\u1ee5c v\u1ee5 c\u00e1c m\u1ee5c \u0111\u00edch kh\u00e1c nhau. HTML \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 c\u1ea5u tr\u00fac n\u1ed9i dung v\u00e0 x\u00e1c \u0111\u1ecbnh ng\u1eef ngh\u0129a c\u1ee7a n\u00f3, trong khi CSS (Cascading Style Sheets) \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o ki\u1ec3u v\u00e0 t\u0103ng c\u01b0\u1eddng tr\u1ef1c quan c\u00e1c th\u00e0nh ph\u1ea7n HTML. HTML t\u1eadp trung v\u00e0o c\u1ea5u tr\u00fac, trong khi CSS t\u1eadp trung v\u00e0o c\u00e1ch tr\u00ecnh b\u00e0y v\u00e0 b\u1ed1 c\u1ee5c.<\/p>\n

    \n
    \"c\u00e1c
    S\u1ef1 kh\u00e1c nhau gi\u1eefa HTML v\u00e0 CSS<\/figcaption><\/figure>\n<\/div>\n

    6. L\u1ee3i \u00edch v\u00e0 h\u1ea1n ch\u1ebf khi s\u1eed d\u1ee5ng CSS l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

    L\u1ee3i \u00edch c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng CSS bao g\u1ed3m:<\/p>\n

      \n
    • Ki\u1ec3u d\u00e1ng nh\u1ea5t qu\u00e1n tr\u00ean nhi\u1ec1u trang web<\/li>\n
    • T\u00e1ch n\u1ed9i dung v\u00e0 tr\u00ecnh b\u00e0y, n\u00e2ng cao kh\u1ea3 n\u0103ng b\u1ea3o tr\u00ec m\u00e3<\/li>\n
    • T\u1ea3i trang hi\u1ec7u qu\u1ea3 do c\u00e1c t\u1ec7p CSS b\u00ean ngo\u00e0i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m<\/li>\n<\/ul>\n

      H\u1ea1n ch\u1ebf c\u1ee7a vi\u1ec7c s\u1eed d\u1ee5ng CSS bao g\u1ed3m:<\/p>\n

        \n
      • C\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 t\u00ednh t\u01b0\u01a1ng th\u00edch c\u1ee7a tr\u00ecnh duy\u1ec7t, v\u00ec c\u00e1c tr\u00ecnh duy\u1ec7t kh\u00e1c nhau c\u00f3 th\u1ec3 di\u1ec5n gi\u1ea3i c\u00e1c quy t\u1eafc CSS kh\u00e1c nhau<\/li>\n
      • \u0110\u01b0\u1eddng cong h\u1ecdc t\u1eadp cho c\u00e1c thi\u1ebft k\u1ebf b\u1ed1 c\u1ee5c ph\u1ee9c t\u1ea1p v\u00e0 c\u00e1c t\u00ednh n\u0103ng CSS n\u00e2ng cao<\/li>\n
      • CSS c\u00f3 th\u1ec3 kh\u00f4ng cung c\u1ea5p kh\u1ea3 n\u0103ng ki\u1ec3m so\u00e1t ho\u00e0n to\u00e0n \u0111\u1ed1i v\u1edbi m\u1ed9t s\u1ed1 kh\u00eda c\u1ea1nh h\u00ecnh \u1ea3nh nh\u1ea5t \u0111\u1ecbnh, y\u00eau c\u1ea7u c\u00e1c k\u1ef9 thu\u1eadt ho\u1eb7c c\u00f4ng ngh\u1ec7 b\u1ed5 sung.<\/li>\n<\/ul>\n

        7. C\u00e1c lo\u1ea1i Selectors kh\u00e1c nhau trong CSS l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

        Selectors hay b\u1ed9 ch\u1ecdn CSS x\u00e1c \u0111\u1ecbnh nh\u1eefng th\u00e0nh ph\u1ea7n n\u00e0o tr\u00ean trang web s\u1ebd \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng c\u00e1c quy t\u1eafc CSS. M\u1ed9t s\u1ed1 b\u1ed9 ch\u1ecdn CSS ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

          \n
        • B\u1ed9 ch\u1ecdn l\u1edbp (v\u00ed d\u1ee5: .class-name) nh\u1eafm m\u1ee5c ti\u00eau c\u00e1c ph\u1ea7n t\u1eed c\u00f3 thu\u1ed9c t\u00ednh l\u1edbp c\u1ee5 th\u1ec3.<\/li>\n
        • B\u1ed9 ch\u1ecdn ID (v\u00ed d\u1ee5: #id-name) nh\u1eafm m\u1ee5c ti\u00eau m\u1ed9t ph\u1ea7n t\u1eed duy nh\u1ea5t c\u00f3 thu\u1ed9c t\u00ednh ID c\u1ee5 th\u1ec3.<\/li>\n
        • B\u1ed9 ch\u1ecdn ph\u1ea7n t\u1eed (v\u00ed d\u1ee5: p) nh\u1eafm m\u1ee5c ti\u00eau t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed c\u1ee7a m\u1ed9t lo\u1ea1i c\u1ee5 th\u1ec3, ch\u1eb3ng h\u1ea1n nh\u01b0 \u0111o\u1ea1n v\u0103n.<\/li>\n
        • B\u1ed9 ch\u1ecdn thu\u1ed9c t\u00ednh (v\u00ed d\u1ee5: [thu\u1ed9c t\u00ednh=gi\u00e1 tr\u1ecb]) nh\u1eafm m\u1ee5c ti\u00eau c\u00e1c ph\u1ea7n t\u1eed d\u1ef1a tr\u00ean c\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh c\u1ee5 th\u1ec3.<\/li>\n<\/ul>\n

          8. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 \u0111\u01b0a CSS v\u00e0o trong m\u1ed9t trang web\u00a0<\/strong><\/h4>\n

          CSS c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c \u0111\u01b0a v\u00e0o t\u00e0i li\u1ec7u HTML theo ba c\u00e1ch:<\/p>\n

            \n
          • CSS n\u1ed9i tuy\u1ebfn: C\u00e1c quy t\u1eafc CSS \u0111\u01b0\u1ee3c \u00e1p d\u1ee5ng tr\u1ef1c ti\u1ebfp cho c\u00e1c ph\u1ea7n t\u1eed HTML ri\u00eang l\u1ebb b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng thu\u1ed9c t\u00ednh style.<\/li>\n
          • CSS n\u1ed9i b\u1ed9: C\u00e1c quy t\u1eafc CSS \u0111\u01b0\u1ee3c \u0111\u1eb7t trong c\u00e1c th\u1ebb <style> trong ph\u1ea7n <head> c\u1ee7a t\u00e0i li\u1ec7u HTML.<\/li>\n
          • CSS ngo\u00e0i: C\u00e1c quy t\u1eafc CSS \u0111\u01b0\u1ee3c vi\u1ebft trong m\u1ed9t t\u1ec7p CSS ri\u00eang bi\u1ec7t v\u00e0 \u0111\u01b0\u1ee3c li\u00ean k\u1ebft v\u1edbi t\u00e0i li\u1ec7u HTML b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng th\u1ebb <link> trong ph\u1ea7n <head>.<\/li>\n<\/ul>\n

            9. S\u1ef1 kh\u00e1c nhau gi\u1eefa inline, inline-block v\u00e0 block l\u00e0 g\u00ec?<\/strong><\/h4>\n
              \n
            • Inline hay c\u00e1c ph\u1ea7n t\u1eed n\u1ed9i tuy\u1ebfn kh\u00f4ng b\u1eaft \u0111\u1ea7u tr\u00ean m\u1ed9t d\u00f2ng m\u1edbi v\u00e0 ch\u1ec9 chi\u1ebfm nhi\u1ec1u chi\u1ec1u r\u1ed9ng khi c\u1ea7n thi\u1ebft. V\u00ed d\u1ee5 bao g\u1ed3m <span> v\u00e0 <a>.<\/li>\n
            • Inline-block hay c\u00e1c ph\u1ea7n t\u1eed kh\u1ed1i n\u1ed9i tuy\u1ebfn t\u01b0\u01a1ng t\u1ef1 nh\u01b0 c\u00e1c ph\u1ea7n t\u1eed n\u1ed9i tuy\u1ebfn nh\u01b0ng cho ph\u00e9p \u0111\u1eb7t chi\u1ec1u r\u1ed9ng, chi\u1ec1u cao, l\u1ec1 v\u00e0 ph\u1ea7n \u0111\u1ec7m. V\u00ed d\u1ee5 bao g\u1ed3m <img> v\u00e0 <button>.<\/li>\n
            • Block hay c\u00e1c ph\u1ea7n t\u1eed kh\u1ed1i b\u1eaft \u0111\u1ea7u tr\u00ean m\u1ed9t d\u00f2ng m\u1edbi v\u00e0 chi\u1ebfm to\u00e0n b\u1ed9 chi\u1ec1u r\u1ed9ng c\u00f3 s\u1eb5n. V\u00ed d\u1ee5 bao g\u1ed3m <div> v\u00e0 <p>.\u00a0<\/li>\n<\/ul>\n

              10. CSS Preprocessor l\u00e0 g\u00ec?\u00a0 Sass, Less, Stylus l\u00e0 g\u00ec v\u00e0 t\u1ea1i sao l\u1ea1i s\u1eed d\u1ee5ng ch\u00fang?\u00a0<\/strong><\/h4>\n

              CSS Preprocessor hay b\u1ed9 ti\u1ec1n x\u1eed l\u00fd CSS l\u00e0 ng\u00f4n ng\u1eef k\u1ecbch b\u1ea3n m\u1edf r\u1ed9ng kh\u1ea3 n\u0103ng c\u1ee7a CSS. Ch\u00fang cho ph\u00e9p s\u1eed d\u1ee5ng c\u00e1c bi\u1ebfn, mixin, quy t\u1eafc l\u1ed3ng nhau v\u00e0 c\u00e1c t\u00ednh n\u0103ng n\u00e2ng cao kh\u00e1c, gi\u00fap m\u00e3 CSS d\u1ec5 b\u1ea3o tr\u00ec v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n. Sass, Less v\u00e0 Stylus l\u00e0 c\u00e1c b\u1ed9 ti\u1ec1n x\u1eed l\u00fd CSS ph\u1ed5 bi\u1ebfn bi\u00ean d\u1ecbch th\u00e0nh c\u00fa ph\u00e1p CSS ti\u00eau chu\u1ea9n.<\/p>\n

              C\u00e2u h\u1ecfi ph\u1ecfng v\u1ea5n HTML CSS d\u00e0nh cho ng\u01b0\u1eddi c\u00f3 kinh nghi\u1ec7m\u00a0<\/strong><\/h3>\n

              11. Khi n\u00e0o th\u00ec DOW reflow x\u1ea3y ra?\u00a0<\/strong><\/h4>\n

              DOW (M\u00f4 h\u00ecnh \u0111\u1ed1i t\u01b0\u1ee3ng t\u00e0i li\u1ec7u) reflow, c\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 b\u1ed1 c\u1ee5c ho\u1eb7c ch\u1ec9nh l\u1ea1i d\u00f2ng, x\u1ea3y ra khi c\u00e1c thay \u0111\u1ed5i \u0111\u1ed1i v\u1edbi DOM (th\u00eam, x\u00f3a ho\u1eb7c s\u1eeda \u0111\u1ed5i c\u00e1c th\u00e0nh ph\u1ea7n) ho\u1eb7c thu\u1ed9c t\u00ednh CSS \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn b\u1ed1 c\u1ee5c c\u1ee7a trang web. N\u00f3 x\u1ea3y ra khi tr\u00ecnh duy\u1ec7t t\u00ednh to\u00e1n l\u1ea1i v\u1ecb tr\u00ed v\u00e0 k\u00edch th\u01b0\u1edbc c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed d\u1ef1a tr\u00ean th\u00f4ng tin \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt. DOW reflow c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t b\u1eb1ng c\u00e1c h\u00e0nh \u0111\u1ed9ng nh\u01b0 thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc c\u1eeda s\u1ed5 tr\u00ecnh duy\u1ec7t, thay \u0111\u1ed5i k\u00edch th\u01b0\u1edbc ph\u00f4ng ch\u1eef ho\u1eb7c s\u1eeda \u0111\u1ed5i ki\u1ec3u b\u1eb1ng JavaScript.<\/p>\n

              12. N\u00eau c\u00e1c thu\u1ed9c t\u00ednh Box sizing kh\u00e1c nhau trong CSS\u00a0<\/strong><\/h4>\n

              CSS cung c\u1ea5p hai thu\u1ed9c t\u00ednh Box sizing kh\u00e1c nhau:<\/p>\n

                \n
              • content-box: Gi\u00e1 tr\u1ecb m\u1eb7c \u0111\u1ecbnh trong \u0111\u00f3 chi\u1ec1u r\u1ed9ng v\u00e0 chi\u1ec1u cao c\u1ee7a ph\u1ea7n t\u1eed ch\u1ec9 \u0111\u1ea1i di\u1ec7n cho v\u00f9ng n\u1ed9i dung, kh\u00f4ng bao g\u1ed3m ph\u1ea7n \u0111\u1ec7m v\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n.<\/li>\n
              • border-box: Chi\u1ec1u r\u1ed9ng v\u00e0 chi\u1ec1u cao c\u1ee7a ph\u1ea7n t\u1eed bao g\u1ed3m c\u1ea3 v\u00f9ng n\u1ed9i dung c\u0169ng nh\u01b0 ph\u1ea7n \u0111\u1ec7m v\u00e0 \u0111\u01b0\u1eddng vi\u1ec1n. Thu\u1ed9c t\u00ednh n\u00e0y \u0111\u01a1n gi\u1ea3n h\u00f3a vi\u1ec7c t\u00ednh to\u00e1n b\u1ed1 c\u1ee5c b\u1eb1ng c\u00e1ch t\u00ednh to\u00e0n b\u1ed9 k\u00edch th\u01b0\u1edbc c\u1ee7a ph\u1ea7n t\u1eed.<\/li>\n<\/ul>\n

                13. N\u00eau c\u00e1c c\u00e1ch kh\u00e1c nhau \u0111\u1ec3 d\u1ea5u element trong CSS<\/strong><\/h4>\n

                C\u00f3 m\u1ed9t s\u1ed1 c\u00e1ch \u0111\u1ec3 \u1ea9n c\u00e1c ph\u1ea7n t\u1eed (element) trong CSS:<\/p>\n

                  \n
                • display: none: Lo\u1ea1i b\u1ecf ho\u00e0n to\u00e0n ph\u1ea7n t\u1eed kh\u1ecfi lu\u1ed3ng t\u00e0i li\u1ec7u, l\u00e0m cho ph\u1ea7n t\u1eed \u1ea9n v\u00e0 kh\u00f4ng chi\u1ebfm b\u1ea5t k\u1ef3 dung l\u01b0\u1ee3ng n\u00e0o.<\/li>\n
                • visibility: hidden: \u1ea8n ph\u1ea7n t\u1eed nh\u01b0ng v\u1eabn d\u00e0nh kh\u00f4ng gian m\u00e0 n\u00f3 chi\u1ebfm gi\u1eef, duy tr\u00ec v\u1ecb tr\u00ed c\u1ee7a n\u00f3 trong b\u1ed1 c\u1ee5c.<\/li>\n
                • opacity: 0: L\u00e0m cho ph\u1ea7n t\u1eed trong su\u1ed1t, \u1ea9n n\u00f3 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 trong khi v\u1eabn chi\u1ebfm kh\u00f4ng gian v\u00e0 gi\u1eef nguy\u00ean b\u1ed1 c\u1ee5c c\u1ee7a n\u00f3.<\/li>\n<\/ul>\n

                  14. S\u1ef1 kh\u00e1c nhau gi\u1eefa CSS grid v\u00e0 flexbox l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

                  CSS grid v\u00e0 flexbox l\u00e0 c\u00e1c h\u1ec7 th\u1ed1ng b\u1ed1 c\u1ee5c trong CSS, nh\u01b0ng ch\u00fang c\u00f3 c\u00e1c m\u1ee5c \u0111\u00edch kh\u00e1c nhau:<\/p>\n

                    \n
                  • CSS grid: Cho ph\u00e9p b\u1ed1 c\u1ee5c d\u1ef1a tr\u00ean l\u01b0\u1edbi hai chi\u1ec1u, chia kh\u00f4ng gian c\u00f3 s\u1eb5n th\u00e0nh c\u00e1c h\u00e0ng v\u00e0 c\u1ed9t. \u0110\u00f3 l\u00e0 l\u00fd t\u01b0\u1edfng cho c\u00e1c b\u1ed1 c\u1ee5c ph\u1ee9c t\u1ea1p v\u00e0 s\u1eafp x\u1ebfp c\u00e1c m\u1ee5c theo c\u1ea3 hai h\u01b0\u1edbng.<\/li>\n
                  • Flexbox: Cung c\u1ea5p m\u00f4 h\u00ecnh b\u1ed1 c\u1ee5c m\u1ed9t chi\u1ec1u, theo h\u00e0ng ho\u1eb7c theo c\u1ed9t. N\u00f3 t\u1eadp trung v\u00e0o vi\u1ec7c ph\u00e2n ph\u1ed1i v\u00e0 s\u1eafp x\u1ebfp c\u00e1c y\u1ebfu t\u1ed1 theo m\u1ed9t h\u01b0\u1edbng duy nh\u1ea5t. Flexbox ph\u00f9 h\u1ee3p nh\u1ea5t cho b\u1ed1 c\u1ee5c m\u1ed9t chi\u1ec1u, \u0111\u01a1n gi\u1ea3n h\u01a1n.<\/li>\n<\/ul>\n

                    15. !important c\u00f3 \u00fd ngh\u0129a g\u00ec trong CSS?\u00a0<\/strong><\/h4>\n

                    !important l\u00e0 m\u1ed9t khai b\u00e1o CSS \u01b0u ti\u00ean cho m\u1ed9t quy t\u1eafc ki\u1ec3u c\u1ee5 th\u1ec3, ghi \u0111\u00e8 c\u00e1c ki\u1ec3u xung \u0111\u1ed9t kh\u00e1c. Khi !important \u0111\u01b0\u1ee3c th\u00eam v\u00e0o m\u1ed9t thu\u1ed9c t\u00ednh, n\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng quy t\u1eafc n\u00e0y \u0111\u01b0\u1ee3c \u01b0u ti\u00ean h\u01a1n c\u00e1c quy t\u1eafc kh\u00e1c, ngay c\u1ea3 khi ch\u00fang c\u00f3 t\u00ednh \u0111\u1eb7c hi\u1ec7u cao h\u01a1n. N\u00f3i chung, b\u1ea1n n\u00ean s\u1eed d\u1ee5ng !important m\u1ed9t c\u00e1ch ti\u1ebft ki\u1ec7m v\u00e0 ch\u1ec9 khi c\u1ea7n thi\u1ebft, v\u00ec n\u00f3 c\u00f3 th\u1ec3 khi\u1ebfn m\u00e3 CSS kh\u00f3 qu\u1ea3n l\u00fd v\u00e0 b\u1ea3o tr\u00ec h\u01a1n.<\/p>\n

                    \n
                    \"c\u00e2u
                    !important trong CSS<\/figcaption><\/figure>\n<\/div>\n

                    16. HTML tags v\u00e0 elements c\u00f3 gi\u1ed1ng nhau kh\u00f4ng?\u00a0<\/strong><\/h4>\n

                    Trong HTML, c\u00e1c tags v\u00e0 elements c\u00f3 li\u00ean quan ch\u1eb7t ch\u1ebd v\u1edbi nhau nh\u01b0ng kh\u00f4ng ho\u00e0n to\u00e0n gi\u1ed1ng nhau:<\/p>\n

                      \n
                    • HTML tags: Th\u1ec3 hi\u1ec7n c\u1ea5u tr\u00fac \u0111\u00e1nh d\u1ea5u v\u00e0 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng d\u1ea5u ngo\u1eb7c nh\u1ecdn (< v\u00e0 >). Ch\u00fang x\u00e1c \u0111\u1ecbnh ph\u1ea7n \u0111\u1ea7u v\u00e0 ph\u1ea7n cu\u1ed1i c\u1ee7a c\u00e1c ph\u1ea7n t\u1eed HTML.<\/li>\n
                    • HTML elements: Bao g\u1ed3m th\u1ebb m\u1edf, n\u1ed9i dung v\u00e0 th\u1ebb \u0111\u00f3ng. Ch\u00fang bao g\u1ed3m c\u00e1c th\u1ebb v\u00e0 n\u1ed9i dung ch\u00fang bao quanh, t\u1ea1o th\u00e0nh c\u00e1c kh\u1ed1i x\u00e2y d\u1ef1ng c\u1ee7a t\u00e0i li\u1ec7u HTML.<\/li>\n<\/ul>\n

                      17. L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 hi\u1ec3n th\u1ecb m\u1ed9t b\u1ea3ng trong HTML?\u00a0<\/strong><\/h4>\n

                      \u0110\u1ec3 hi\u1ec3n th\u1ecb m\u1ed9t b\u1ea3ng trong HTML, b\u1ea1n c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng ph\u1ea7n t\u1eed <table> c\u00f9ng v\u1edbi c\u00e1c th\u1ebb li\u00ean quan c\u1ee7a n\u00f3:<\/p>\n

                        \n
                      • <table>: \u0110\u1ecbnh ngh\u0129a ch\u00ednh b\u1ea3ng \u0111\u00f3.<\/li>\n
                      • <tr>: \u0110\u1ea1i di\u1ec7n cho m\u1ed9t h\u00e0ng c\u1ee7a b\u1ea3ng.<\/li>\n
                      • <th>: \u0110\u1ecbnh ngh\u0129a m\u1ed9t \u00f4 ti\u00eau \u0111\u1ec1 c\u1ee7a b\u1ea3ng.<\/li>\n
                      • <td>: \u0110\u1ea1i di\u1ec7n cho m\u1ed9t \u00f4 d\u1eef li\u1ec7u b\u1ea3ng (th\u00f4ng th\u01b0\u1eddng).<\/li>\n
                      • <caption>: Cung c\u1ea5p ch\u00fa th\u00edch cho b\u1ea3ng.<\/li>\n<\/ul>\n

                        18. Kho\u1ea3ng tr\u1eafng (white sMasterskills) trong HTML l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n

                        Trong HTML, kho\u1ea3ng tr\u1eafng \u0111\u1ec1 c\u1eadp \u0111\u1ebfn kho\u1ea3ng tr\u1eafng, tab, ng\u1eaft d\u00f2ng v\u00e0 c\u00e1c k\u00fd t\u1ef1 kh\u00e1c \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 th\u1ee5t l\u1ec1 v\u00e0 \u0111\u1ecbnh d\u1ea1ng trong m\u00e3 HTML. Tuy nhi\u00ean, khi hi\u1ec3n th\u1ecb n\u1ed9i dung HTML, tr\u00ecnh duy\u1ec7t s\u1ebd thu g\u1ecdn nhi\u1ec1u kho\u1ea3ng tr\u1eafng th\u00e0nh m\u1ed9t kho\u1ea3ng tr\u1eafng v\u00e0 b\u1ecf qua c\u00e1c kho\u1ea3ng tr\u1eafng th\u1eeba ho\u1eb7c ng\u1eaft d\u00f2ng tr\u1eeb khi \u0111\u01b0\u1ee3c ch\u1ec9 \u0111\u1ecbnh b\u1eb1ng CSS.<\/p>\n

                        19. Ph\u00e2n bi\u1ec7t HTML v\u00e0 XHTML\u00a0<\/strong><\/h4>\n

                        HTML (Ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n) v\u00e0 XHTML (Ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u si\u00eau v\u0103n b\u1ea3n eXtensible) \u0111\u1ec1u l\u00e0 ng\u00f4n ng\u1eef \u0111\u00e1nh d\u1ea5u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u1ea1o c\u00e1c trang web. S\u1ef1 kh\u00e1c bi\u1ec7t ch\u00ednh n\u1eb1m \u1edf c\u00fa ph\u00e1p v\u00e0 quy t\u1eafc c\u1ee7a ch\u00fang:<\/p>\n

                          \n
                        • HTML: C\u00f3 nhi\u1ec1u quy t\u1eafc c\u00fa ph\u00e1p d\u1ec5 thay \u0111\u1ed5i h\u01a1n, cho ph\u00e9p linh ho\u1ea1t h\u01a1n. N\u00f3 kh\u00f4ng y\u00eau c\u1ea7u \u0111\u00f3ng th\u1ebb cho t\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed.<\/li>\n
                        • XHTML: Tu\u00e2n th\u1ee7 c\u00e1c quy t\u1eafc c\u00fa ph\u00e1p d\u1ef1a tr\u00ean XML ch\u1eb7t ch\u1ebd h\u01a1n. T\u1ea5t c\u1ea3 c\u00e1c ph\u1ea7n t\u1eed ph\u1ea3i \u0111\u01b0\u1ee3c l\u1ed3ng v\u00e0 \u0111\u00f3ng \u0111\u00fang c\u00e1ch, \u0111\u1ed3ng th\u1eddi c\u00e1c gi\u00e1 tr\u1ecb thu\u1ed9c t\u00ednh ph\u1ea3i \u0111\u01b0\u1ee3c \u0111\u1eb7t trong d\u1ea5u ngo\u1eb7c k\u00e9p. XHTML y\u00eau c\u1ea7u c\u00fa ph\u00e1p XML \u0111\u01b0\u1ee3c \u0111\u1ecbnh d\u1ea1ng t\u1ed1t.<\/li>\n<\/ul>\n

                          20. S\u1ef1 kh\u00e1c nhau gi\u1eefa m\u1ed9t URL tuy\u1ec7t \u0111\u1ed1i (absolute URL) v\u00e0 m\u1ed9t URl t\u01b0\u01a1ng \u0111\u1ed1i (relative URL) trong HTML l\u00e0 g\u00ec?\u00a0<\/strong><\/h4>\n
                            \n
                          • URL tuy\u1ec7t \u0111\u1ed1i: Ch\u1ec9 \u0111\u1ecbnh \u0111\u1ecba ch\u1ec9 \u0111\u1ea7y \u0111\u1ee7 c\u1ee7a trang web ho\u1eb7c t\u00e0i nguy\u00ean, bao g\u1ed3m giao th\u1ee9c (v\u00ed d\u1ee5: http:\/\/ ho\u1eb7c https:\/\/), t\u00ean mi\u1ec1n v\u00e0 \u0111\u01b0\u1eddng d\u1eabn t\u1ec7p. N\u00f3 cung c\u1ea5p m\u1ed9t tham chi\u1ebfu tr\u1ef1c ti\u1ebfp v\u00e0 \u0111\u1ea7y \u0111\u1ee7 \u0111\u1ebfn t\u00e0i nguy\u00ean, kh\u00f4ng ph\u1ee5 thu\u1ed9c v\u00e0o v\u1ecb tr\u00ed c\u1ee7a trang hi\u1ec7n t\u1ea1i.<\/li>\n
                          • URL t\u01b0\u01a1ng \u0111\u1ed1i: Ch\u1ec9 \u0111\u1ecbnh \u0111\u01b0\u1eddng d\u1eabn \u0111\u1ebfn trang web ho\u1eb7c t\u00e0i nguy\u00ean li\u00ean quan \u0111\u1ebfn v\u1ecb tr\u00ed c\u1ee7a trang hi\u1ec7n t\u1ea1i. N\u00f3 kh\u00f4ng bao g\u1ed3m giao th\u1ee9c ho\u1eb7c t\u00ean mi\u1ec1n, gi\u1ea3 s\u1eed r\u1eb1ng t\u00e0i nguy\u00ean n\u1eb1m trong c\u00f9ng m\u1ed9t trang web ho\u1eb7c m\u00e1y ch\u1ee7.<\/li>\n<\/ul>\n