Page structure & technical metrics

Words

972

Action candidates

Images

HTML

97 KB

Copy

Title chars

Meta chars

Action

Primary

中文

Forms

On-site links

Off-site links

Security & metadata

HTTPS

yes

HSTS

CSP

nosniff

viewport

yes

Icon

yes

JSON-LD

Analytics

Page

Next.js / Tailwind

Scripts

10 ext / 11 inline

Lang

zh-CN

Third-party hosts

Lighthouse

Simulated mobile · Performance

41 / 100

2026-09-05 · Run warnings: results may be incomplete.

View details

Simulated mobile · Lab data, not field data
2026-09-05T16:46:23.809Z · Lighthouse 13.4.1

This run has warnings; results may be incomplete: The page loaded too slowly to finish within the time limit. Results may be incomplete. · The page may not be loading as expected because your test URL (https://www.deepseek.com/harness/) was redirected to https://www.deepseek.com/harness/en/. Try testing the second URL directly.

Performance41/ 100

Accessibility87/ 100

Best practices100/ 100

SEO85/ 100

LCP · Largest content5,094 ms

CLS · Layout shift0.002

TBT · Blocking time164,431 ms

FCP · First content1,223 ms

SI · Speed index14,426 ms

Results vary by server, network and environment, independently of taste/conversion scores. Diagnostics retain Lighthouse wording.

Max Potential First Input Delay

2,010 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Time to Interactive

176.8 s

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Avoid multiple page redirects

Est savings of 920 ms

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Elements & resources

{
  "type": "opportunity",
  "items": [
    {
      "url": "https://www.deepseek.com/harness/",
      "wastedMs": 922.9028
    },
    {
      "url": "https://www.deepseek.com/harness/en/",
      "wastedMs": 0
    }
  ],
  "headings": [
    {
      "key": "url",
      "label": "URL",
      "valueType": "url"
    },
    {
      "key": "wastedMs",
      "label": "Time Spent",
      "valueType": "timespanMs"
    }
  ],
  "overallSavingsMs": 922.9028
}

Minimize main-thread work

179.6 s

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Elements & resources

{
  "type": "table",
  "items": [
    {
      "group": "other",
      "duration": 176664.89600000065,
      "groupLabel": "Other"
    },
    {
      "group": "scriptEvaluation",
      "duration": 1728.7159999999917,
      "groupLabel": "Script Evaluation"
    },
    {
      "group": "styleLayout",
      "duration": 616.6120000000001,
      "groupLabel": "Style & Layout"
    },
    {
      "group": "scriptParseCompile",
      "duration": 338.6240000000001,
      "groupLabel": "Script Parsing & Compilation"
    },
    {
      "group": "paintCompositeRender",
      "duration": 128.9720000000012,
      "groupLabel": "Rendering"
    },
    {
      "group": "garbageCollection",
      "duration": 108.47200000000001,
      "groupLabel": "Garbage Collection"
    },
    {
      "group": "parseHTML",
      "duration": 50.91599999999999,
      "groupLabel": "Parse HTML & CSS"
    }
  ],
  "headings": [
    {
      "key": "groupLabel",
      "label": "Category",
      "valueType": "text"
    },
    {
      "key": "duration",
      "label": "Time Spent",
      "valueType": "ms",
      "granularity": 1
    }
  ],
  "sortedBy": [
    "duration"
  ]
}

Reduce JavaScript execution time

1.8 s

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Elements & resources

{
  "type": "table",
  "items": [
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/app/%5Blocale%5D/page-f752721b763e9f77.js",
      "total": 165819.52800000008,
      "scripting": 198.88400000000004,
      "scriptParseCompile": 22.156
    },
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/26fbc61a-ceed69912acb9826.js",
      "total": 7327.268000000001,
      "scripting": 29.383999999999954,
      "scriptParseCompile": 40.483999999999995
    },
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/194.9af4cd38a39a29b3.js",
      "total": 1717.9520000000005,
      "scripting": 46.86000000000002,
      "scriptParseCompile": 22.391999999999996
    },
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/813-c2428501b5dbabee.js",
      "total": 1599.1520000000003,
      "scripting": 28.98799999999999,
      "scriptParseCompile": 87.768
    },
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/696-a8b1cdf47b7f00af.js",
      "total": 1180.747999999994,
      "scripting": 992.4879999999939,
      "scriptParseCompile": 19.036
    },
    {
      "url": "Unattributable",
      "total": 887.8759999999771,
      "scripting": 99.668,
      "scriptParseCompile": 0
    },
    {
      "url": "https://www.deepseek.com/harness/en/",
      "total": 598.5560000000003,
      "scripting": 12.971999999999998,
      "scriptParseCompile": 9.795999999999998
    },
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/2c7bdfb3.e1e07d3bc4ed5087.js",
      "total": 131.97600000000003,
      "scripting": 45.04800000000001,
      "scriptParseCompile": 86.54400000000001
    },
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/523.ccc6e89073db6172.js",
      "total": 55.408000000000015,
      "scripting": 53.84800000000001,
      "scriptParseCompile": 0.52
    }
  ],
  "summary": {
    "wastedMs": 1796.835999999994
  },
  "headings": [
    {
      "key": "url",
      "label": "URL",
      "valueType": "url"
    },
    {
      "key": "total",
      "label": "Total CPU Time",
      "valueType": "ms",
      "granularity": 1
    },
    {
      "key": "scripting",
      "label": "Script Evaluation",
      "valueType": "ms",
      "granularity": 1
    },
    {
      "key": "scriptParseCompile",
      "label": "Script Parse",
      "valueType": "ms",
      "granularity": 1
    }
  ],
  "sortedBy": [
    "total"
  ]
}

Missing source maps for large first-party JavaScript

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

Elements & resources

{
  "type": "table",
  "items": [
    {
      "subItems": {
        "type": "subitems",
        "items": [
          {
            "error": "Large JavaScript file is missing a source map"
          }
        ]
      },
      "scriptUrl": "https://www.deepseek.com/harness/_next/static/chunks/2c7bdfb3.e1e07d3bc4ed5087.js"
    }
  ],
  "headings": [
    {
      "key": "scriptUrl",
      "label": "URL",
      "valueType": "url",
      "subItemsHeading": {
        "key": "error"
      }
    },
    {
      "key": "sourceMapUrl",
      "label": "Map URL",
      "valueType": "url"
    }
  ]
}

Elements use prohibited ARIA attributes

Using ARIA attributes in roles where they are prohibited can mean that important information is not communicated to users of assistive technologies. Learn more about prohibited ARIA roles.

Elements & resources

{
  "type": "table",
  "items": [
    {
      "node": {
        "lhId": "1-0-SPAN",
        "path": "1,HTML,1,BODY,0,DIV,2,MAIN,6,FOOTER,1,DIV,0,DIV,0,DIV,0,SPAN,0,SPAN",
        "type": "node",
        "snippet": "<span class=\"w-5 h-5 flex items-center justify-center\" aria-label=\"WeChat\">",
        "selector": "div.flex > div.ds-qr-trigger > span.flex > span.w-5",
        "nodeLabel": "WeChat",
        "explanation": "Fix all of the following:\n  aria-label attribute cannot be used on a span with no valid role attribute.",
        "boundingRect": {
          "top": 7175,
          "left": 113,
          "right": 133,
          "width": 20,
          "bottom": 7195,
          "height": 20
        }
      }
    }
  ],
  "headings": [
    {
      "key": "node",
      "label": "Failing Elements",
      "valueType": "node",
      "subItemsHeading": {
        "key": "relatedNode",
        "valueType": "node"
      }
    }
  ],
  "debugData": {
    "tags": [
      "cat.aria",
      "wcag2a",
      "wcag412",
      "EN-301-549",
      "EN-9.4.1.2",
      "RGAAv4",
      "RGAA-7.1.1"
    ],
    "type": "debugdata",
    "impact": "serious"
  }
}

Buttons do not have an accessible name

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Elements & resources

{
  "type": "table",
  "items": [
    {
      "node": {
        "lhId": "1-1-BUTTON",
        "path": "1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,2,BUTTON",
        "type": "node",
        "snippet": "<button class=\"md:hidden flex items-center justify-center w-10 h-10 text-ds-primary\">",
        "selector": "div.relative > div.ds-header-wrapper > div.ds-header-bar > button.md:hidden",
        "nodeLabel": "div.relative > div.ds-header-wrapper > div.ds-header-bar > button.md:hidden",
        "explanation": "Fix any of the following:\n  Element does not have inner text that is visible to screen readers\n  aria-label attribute does not exist or is empty\n  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty\n  Element has no title attribute\n  Element does not have an implicit (wrapped) <label>\n  Element does not have an explicit <label>\n  Element's default semantics were not overridden with role=\"none\" or role=\"presentation\"",
        "boundingRect": {
          "top": 13,
          "left": 347,
          "right": 387,
          "width": 40,
          "bottom": 53,
          "height": 40
        }
      }
    },
    {
      "node": {
        "lhId": "1-2-BUTTON",
        "path": "1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,1,BUTTON",
        "type": "node",
        "snippet": "<button class=\"flex items-center justify-center w-10 h-10 text-ds-primary\">",
        "selector": "div.relative > div.ds-mobile-menu > div.ds-mobile-menu-header > button.flex",
        "nodeLabel": "div.relative > div.ds-mobile-menu > div.ds-mobile-menu-header > button.flex",
        "explanation": "Fix any of the following:\n  Element does not have inner text that is visible to screen readers\n  aria-label attribute does not exist or is empty\n  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty\n  Element has no title attribute\n  Element does not have an implicit (wrapped) <label>\n  Element does not have an explicit <label>\n  Element's default semantics were not overridden with role=\"none\" or role=\"presentation\"",
        "boundingRect": {
          "top": 13,
          "left": 347,
          "right": 387,
          "width": 40,
          "bottom": 53,
          "height": 40
        }
      }
    }
  ],
  "headings": [
    {
      "key": "node",
      "label": "Failing Elements",
      "valueType": "node",
      "subItemsHeading": {
        "key": "relatedNode",
        "valueType": "node"
      }
    }
  ],
  "debugData": {
    "tags": [
      "cat.name-role-value",
      "wcag2a",
      "wcag412",
      "section508",
      "section508.22.a",
      "TTv5",
      "TT6.a",
      "EN-301-549",
      "EN-9.4.1.2",
      "ACT",
      "RGAAv4",
      "RGAA-11.9.1"
    ],
    "type": "debugdata",
    "impact": "critical"
  }
}

Links do not have a discernible name

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Elements & resources

{
  "type": "table",
  "items": [
    {
      "node": {
        "lhId": "1-3-A",
        "path": "1,HTML,1,BODY,0,DIV,1,DIV,0,DIV,0,A",
        "type": "node",
        "snippet": "<a class=\"flex items-center text-[var(--ds-color-brand-medium-reverse)]\" href=\"/harness/en/\">",
        "selector": "div.relative > div.ds-mobile-menu > div.ds-mobile-menu-header > a.flex",
        "nodeLabel": "div.relative > div.ds-mobile-menu > div.ds-mobile-menu-header > a.flex",
        "explanation": "Fix all of the following:\n  Element is in tab order and does not have accessible text\n\nFix any of the following:\n  Element does not have text that is visible to screen readers\n  aria-label attribute does not exist or is empty\n  aria-labelledby attribute does not exist, references elements that do not exist or references elements that are empty\n  Element has no title attribute",
        "boundingRect": {
          "top": 22,
          "left": 25,
          "right": 168,
          "width": 143,
          "bottom": 45,
          "height": 23
        }
      }
    }
  ],
  "headings": [
    {
      "key": "node",
      "label": "Failing Elements",
      "valueType": "node",
      "subItemsHeading": {
        "key": "relatedNode",
        "valueType": "node"
      }
    }
  ],
  "debugData": {
    "tags": [
      "cat.name-role-value",
      "wcag2a",
      "wcag244",
      "wcag412",
      "section508",
      "section508.22.a",
      "TTv5",
      "TT6.a",
      "EN-301-549",
      "EN-9.2.4.4",
      "EN-9.4.1.2",
      "ACT",
      "RGAAv4",
      "RGAA-6.2.1"
    ],
    "type": "debugdata",
    "impact": "serious"
  }
}

Reduce unused JavaScript

Est savings of 22 KiB

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Elements & resources

{
  "type": "opportunity",
  "items": [
    {
      "url": "https://www.deepseek.com/harness/_next/static/chunks/813-c2428501b5dbabee.js",
      "totalBytes": 22388,
      "wastedBytes": 22348,
      "wastedPercent": 99.82070911582089
    }
  ],
  "headings": [
    {
      "key": "url",
      "label": "URL",
      "valueType": "url",
      "subItemsHeading": {
        "key": "source",
        "valueType": "code"
      }
    },
    {
      "key": "totalBytes",
      "label": "Transfer Size",
      "valueType": "bytes",
      "subItemsHeading": {
        "key": "sourceBytes"
      }
    },
    {
      "key": "wastedBytes",
      "label": "Est Savings",
      "valueType": "bytes",
      "subItemsHeading": {
        "key": "sourceWastedBytes"
      }
    }
  ],
  "sortedBy": [
    "wastedBytes"
  ],
  "debugData": {
    "type": "debugdata",
    "metricSavings": {
      "FCP": 0,
      "LCP": 150
    }
  },
  "overallSavingsMs": 150,
  "overallSavingsBytes": 22348
}

Document doesn't have a valid `hreflang`

hreflang links tell search engines what version of a page they should list in search results for a given language or region. Learn more about `hreflang`.

Elements & resources

{
  "type": "table",
  "items": [
    {
      "source": {
        "lhId": "1-45-LINK",
        "path": "1,HTML,0,HEAD,21,LINK",
        "type": "node",
        "snippet": "<link rel=\"alternate\" hreflang=\"zh-CN\" href=\"/harness/\" />",
        "selector": "head > link",
        "nodeLabel": "head > link",
        "boundingRect": {
          "top": 0,
          "left": 0,
          "right": 0,
          "width": 0,
          "bottom": 0,
          "height": 0
        }
      },
      "subItems": {
        "type": "subitems",
        "items": [
          {
            "reason": "Relative href value"
          }
        ]
      }
    },
    {
      "source": {
        "lhId": "1-46-LINK",
        "path": "1,HTML,0,HEAD,22,LINK",
        "type": "node",
        "snippet": "<link rel=\"alternate\" hreflang=\"en-US\" href=\"/harness/en/\" />",
        "selector": "head > link",
        "nodeLabel": "head > link",
        "boundingRect": {
          "top": 0,
          "left": 0,
          "right": 0,
          "width": 0,
          "bottom": 0,
          "height": 0
        }
      },
      "subItems": {
        "type": "subitems",
        "items": [
          {
            "reason": "Relative href value"
          }
        ]
      }
    },
    {
      "source": {
        "lhId": "1-47-LINK",
        "path": "1,HTML,0,HEAD,23,LINK",
        "type": "node",
        "snippet": "<link rel=\"alternate\" hreflang=\"x-default\" href=\"/harness/\" />",
        "selector": "head > link",
        "nodeLabel": "head > link",
        "boundingRect": {
          "top": 0,
          "left": 0,
          "right": 0,
          "width": 0,
          "bottom": 0,
          "height": 0
        }
      },
      "subItems": {
        "type": "subitems",
        "items": [
          {
            "reason": "Relative href value"
          }
        ]
      }
    }
  ],
  "headings": [
    {
      "key": "source",
      "label": "",
      "valueType": "code",
      "subItemsHeading": {
        "key": "reason",
        "valueType": "text"
      }
    }
  ]
}

Document does not have a valid `rel=canonical`

Canonical links suggest which URL to show in search results. Learn more about canonical links.

Environment & raw metrics

{
  "finalUrl": "https://www.deepseek.com/harness/en/",
  "userAgent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) HeadlessChrome/151.0.0.0 Safari/537.36",
  "formFactor": "mobile",
  "throttlingMethod": "simulate",
  "throttling": {
    "rttMs": 150,
    "throughputKbps": 1638.4,
    "requestLatencyMs": 562.5,
    "uploadThroughputKbps": 675,
    "cpuSlowdownMultiplier": 4,
    "downloadThroughputKbps": 1474.5600000000002
  },
  "metrics": [
    {
      "id": "largest-contentful-paint",
      "unit": "millisecond",
      "value": 5093.9028
    },
    {
      "id": "cumulative-layout-shift",
      "unit": "unitless",
      "value": 0.001633655803097624
    },
    {
      "id": "total-blocking-time",
      "unit": "millisecond",
      "value": 164431
    },
    {
      "id": "first-contentful-paint",
      "unit": "millisecond",
      "value": 1222.9027999999998
    },
    {
      "id": "speed-index",
      "unit": "millisecond",
      "value": 14426.20565205807
    }
  ]
}

01 / WHAT WORKS

What makes it work

Immediate friction-free developer onboarding snippet

The hero terminal widget immediately presents '$ npx @deepseek-ai/dsh web' with an active one-click copy button, allowing developers to test the preview within seconds without reading lengthy setup instructions.

Disciplined dark glass design language and typography

The visual hierarchy pairs DM Sans and Montserrat display headings over deep background '#0a0a0a' with subtle translucent borders ('rgba(255, 255, 255, 0.06)' and '0.15'), avoiding visual clutter.

02 / NEXT STEPS

Where to go next

01
Establish a singular primary conversion path in the hero action cluster
Currently, '查看 GitHub' (white pill) sits adjacent to three identical translucent pills ('开发者文档', '社区插件', 'Cordis 论文'). On mobile, this creates a clumsy 2x2 wrapping block that competes with the terminal runner right above it.
Consolidate the hero bottom links: keep '查看 GitHub' as the prominent primary action and '开发者文档' as secondary; move '社区插件' and 'Cordis 论文' to the top navigation header or a dedicated ecosystem block. Verify visually on 390px viewport that buttons do not wrap awkwardly.
02
Provide mobile-optimized padding for code terminal tabs
On the mobile viewport (390px), the tabs '一键使用' and '源码安装' rest directly against the top left of the terminal container with minimal breathing room, making thumb taps prone to misclicks.
Increase the tab container touch target height to at least 44px on mobile viewports and apply a smooth segment-control container with '--ds-radius-pill' or rounded pill bounds. Verify tap targets in mobile devtools.

03 / DESIGN LANGUAGE

A design system you can reuse

Colors

Background

#0a0a0a

Text

#ffffff

Typography

Display font: Montserrat
Body font: DM Sans
Heading / body: 46px / 16px

Spacing & shape

Section gap: 0px
Component inset: —
Card radius: —
Button radius: 100px

CLEARER WORDS

Copy Revision Diff

Now

模型、工具、技能、会话、沙箱、存储、循环、调度、UI 等所有 Agent 能力均由插件组合而成，可以自由替换和灵活重组。

SUGGESTED COPY

从模型、工具到沙箱与调度，所有 Agent 能力皆为 Cordis 插件。配置即装配，无需修改核心源码。

The existing sentence lists 9 nouns back-to-back, reducing scan speed. Tightening it focuses immediately on developer modularity and zero core edits.

04 / EVIDENCE

The detail behind the report

Explore each observation, recommendation and captured record.

Conversion3 observations

Share card is incomplete

High

A blank or generic unfurl on X, Slack, or WeChat wastes the click you already earned. This is distribution, not decoration.

Set og:title, og:description, and a 1200x630 image that matches the live headline.

og:title=no og:image=no

No human or proof on the page

Medium

A stranger landing on an AI-looking site with no maker, no customer, and no contact will not give you an email.

Add a real name, a real face, a real contact method, or one real customer line.

no about, no first-person, no quote

No analytics on the live page

Medium

If you cannot see who bounced, you cannot tell if the next fix worked. Shipping without a counter is flying blind.

Put Plausible, PostHog, or GA4 on the public pages. One snippet is enough.

no gtag / plausible / posthog / umami

Launch4 observations

No HSTS header

Medium

Without Strict-Transport-Security, a first visit can still be downgraded to http. Browsers will not pin HTTPS.

Set Strict-Transport-Security: max-age=31536000; includeSubDomains at the edge.

strict-transport-security missing

No Content-Security-Policy

A CSP is the standard way to limit script sources. Vibe-coded pages often load anything, including injected scripts.

Start with a report-only CSP, then default-src 'self' and an explicit script-src.

content-security-policy missing

No X-Content-Type-Options

Without nosniff, browsers may interpret a file as a different type than you sent. It is a one-line header.

Set X-Content-Type-Options: nosniff.

x-content-type-options missing

No Referrer-Policy

The default referrer can leak internal paths and query strings to third parties.

Set Referrer-Policy: strict-origin-when-cross-origin.

referrer-policy missing

05 / MAKE IT HAPPEN

Give your AI a clear next step

Use the improvement prompt for this page, or the design prompt to borrow its visual language. “Recreate” includes references and implementation steps. Paste either into your coding assistant.

Preview full instructions

Review the hero section CTA cluster and terminal switcher on https://www.deepseek.com/harness/:
1. In the hero link bar at the bottom, maintain '查看 GitHub' with white solid background ('--ds-btn-primary-bg: #fff', text '#0a0a0a') as primary, and '开发者文档' with border '1px solid rgba(255, 255, 255, 0.15)' as secondary. Move '社区插件' and 'Cordis 论文' into the desktop navigation bar and footer ecosystem links to prevent wrapping clutter on 390px mobile viewports.
2. In the terminal code runner widget, increase tab button touch target to min-height 44px for '一键使用' and '源码安装'. On mobile (max-width: 768px), align the tab switcher cleanly above the terminal box with 8px bottom gap.
3. Preserve all existing CSS tokens: background '#0a0a0a', fonts 'Montserrat' for display and 'DM Sans' for body, mono 'Fragment Mono', and pill radius 100px. Verify layout at both 1440px and 390px viewports without horizontal scrolling.

Page structure & technical metrics

Copy

Action

Security & metadata

Page

Lighthouse

Max Potential First Input Delay

Time to Interactive

Avoid multiple page redirects

Minimize main-thread work

Reduce JavaScript execution time

Missing source maps for large first-party JavaScript

Elements use prohibited ARIA attributes

Buttons do not have an accessible name

Links do not have a discernible name

Reduce unused JavaScript

Document doesn't have a valid `hreflang`

Document does not have a valid `rel=canonical`

What makes it work

Immediate friction-free developer onboarding snippet

Disciplined dark glass design language and typography

Where to go next

Establish a singular primary conversion path in the hero action cluster

Provide mobile-optimized padding for code terminal tabs

A design system you can reuse

Colors

Typography

Spacing & shape

Copy Revision Diff

The detail behind the report

Share card is incomplete

No human or proof on the page

No analytics on the live page

No HSTS header

No Content-Security-Policy

No X-Content-Type-Options

No Referrer-Policy

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