"box model" meaning in English

{
  "etymology_text": "So called because the padding, border, and margin can be visualised as three levels of boxes surrounding an element.",
  "forms": [
    {
      "form": "box models",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "box model (plural box models)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Internet",
          "orig": "en:Internet",
          "parents": [
            "Computing",
            "Networking",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The set of CSS rules that govern the size, shape, spacing, borders, and margins of web page elements."
      ],
      "id": "en-box_model-en-noun-lPqpINj4",
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "CSS",
          "CSS"
        ],
        [
          "web page",
          "web page"
        ]
      ],
      "raw_glosses": [
        "(Internet) The set of CSS rules that govern the size, shape, spacing, borders, and margins of web page elements."
      ],
      "tags": [
        "Internet"
      ],
      "wikipedia": [
        "CSS box model"
      ]
    }
  ],
  "word": "box model"
}

{
  "etymology_text": "So called because the padding, border, and margin can be visualised as three levels of boxes surrounding an element.",
  "forms": [
    {
      "form": "box models",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "box model (plural box models)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Internet"
      ],
      "glosses": [
        "The set of CSS rules that govern the size, shape, spacing, borders, and margins of web page elements."
      ],
      "links": [
        [
          "Internet",
          "Internet"
        ],
        [
          "CSS",
          "CSS"
        ],
        [
          "web page",
          "web page"
        ]
      ],
      "raw_glosses": [
        "(Internet) The set of CSS rules that govern the size, shape, spacing, borders, and margins of web page elements."
      ],
      "tags": [
        "Internet"
      ],
      "wikipedia": [
        "CSS box model"
      ]
    }
  ],
  "word": "box model"
}