Bộ quy tắc đằng sau mọi website

Từ cẩm nang

• Hero image loads firstBắt buộcweb.dev
• Reserve space for mediaBắt buộcweb.dev
• Core Web Vitals targetsweb.dev · Google Search Central
• Lazy-load only below the foldweb.dev

Từ cẩm nang

• Specific <title>Bắt buộcGoogle Search Central
• One absolute, self-referencing canonicalBắt buộcGoogle Search Central
• LocalBusiness JSON-LD, most specific typeBắt buộcGoogle Search Central · schema.org
• No star markup about yourselfBắt buộcGoogle Search Central · Federal Trade Commission

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• AI features need normal SEO, not tricksBắt buộcGoogle Search Central
• Let AI search crawlers inBắt buộcOpenAI (owner of the crawlers) · Google Search Central
• One consistent identity (name, address, phone)Bắt buộcGoogle Business Profile Help · Microsoft Bing (owner of the system) · Google Search Central
• Real people, never invented onesBắt buộcGoogle Search Central · Nielsen Norman Group

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• Text alternatives (1.1.1)Bắt buộcW3C
• Landmarks and headings (1.3.1)Bắt buộcW3C
• Language of page (3.1.1)Bắt buộcW3C
• Identify input purpose (1.3.5)Bắt buộcW3C · MDN

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• One primary conversion, repeatedBắt buộcUnbounce · Google Ads Help
• What, where, next step: first screenBắt buộcNielsen Norman Group · Google Ads Help · Unbounce
• Phone visible and tappableBắt buộcNielsen Norman Group · Google Ads Help
• Short formsBắt buộcNielsen Norman Group · Baymard Institute

Từ cẩm nang

• Short, whole-word menu labelsBắt buộcNielsen Norman Group
• Readable line lengthweb.dev
• Fluid type with a floorweb.dev
• Few sizes, clear hierarchyNielsen Norman Group

Từ cẩm nang

• HTTPS with HSTSBắt buộcMDN · Google Search Central
• X-Content-Type-Options: nosniffBắt buộcMDN
• Clickjacking protectionBắt buộcMDN
• Third-party code: none, or pinnedBắt buộcMDN · web.dev

Từ cẩm nang

• Privacy notice whenever we collect dataBắt buộcCalifornia Attorney General · Office of the Privacy Commissioner of Canada · Commission d'accès à l'information du Québec
• EU/EEA: opt-in before non-essential tagsBắt buộcEuropean Data Protection Board · Google Tag Platform · Google Tag Manager Help
• UK: PECR as amended (DUAA) and ICO 2026 guidanceBắt buộcICO (UK)
• Brazil: LGPD cookie guidance (ANPD)Bắt buộcANPD (Brazil)

Từ cẩm nang

• Paid-search (PPC) lead generationUnbounce · Google Ads Help · Google Ads Policy Help
• Local service quote requestNielsen Norman Group · Baymard Institute · Unbounce
• Booking / appointmentUnbounce · Nielsen Norman Group · web.dev
• Event / registration (in person)Google Search Central · Federal Trade Commission