happytails.ai

CSS Inliner

Open CSS Inliner on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "css-inliner",
  "category": "developer-tools",
  "built": true,
  "requirements": "Inline supported selectors for email HTML; preserve unsupported-rule warnings.",
  "implementation": {
    "fields": [
      {
        "key": "css",
        "label": "Additional CSS",
        "value": "",
        "type": "textarea"
      }
    ],
    "note": "Inlines supported rules locally. Media queries, pseudo-class behavior, external stylesheets and email-client rendering need review. External stylesheets are not fetched.",
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 1000000,
      "inputMode": "text",
      "label": "CSS",
      "placeholder": "a { color: #3366cc; }",
      "help": "Paste CSS rules, including their selectors. Up to 1,000,000 characters. Review the settings before running.",
      "helpParts": [
        "Paste CSS rules, including their selectors.",
        "Up to 1,000,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

Move supported CSS rules into HTML elements for email templates.

How to use CSS inliner
  1. Enter css in the input field.
  2. Review the settings, then choose Run CSS inliner.
  3. Review the result, then use Copy result or a download link when available.

Useful next steps

HTML formatterCSS formatterJavascript formatter

Working with css inliner

Formatting makes existing data or code easier to read. Validation checks whether it follows a syntax or schema. Conversion maps it into another representation. Choosing the right operation helps avoid treating a neatly formatted result as proof that the underlying data is correct.

Common questions

Does valid JSON mean the data is correct?

Syntax validation only establishes that the text can be parsed as JSON. A schema can check required fields and types, but neither proves that an email address, price or external record is factually correct.

Is decoding the same as decrypting or verifying?

No. Base64 and URL encoding are representations, not encryption. Reading a token payload does not verify its signature. Use the specific validation or verification process required by the system receiving the result.

Continue your workflow: HTML formatter, CSS formatter, Javascript formatter.