Este es un ejemplo típico de un formulario HTML.
| 1 | <!DOCTYPE html> |
| 2 | <html lang="es"> |
| 3 | |
| 4 | <head> |
| 5 | |
| 6 | <meta charset="UTF-8"> |
| 7 | <title>Formulario</title> |
| 8 | <meta name="viewport" |
| 9 | content="width=device-width"> |
| 10 | |
| 11 | <style> |
| 12 | body { |
| 13 | font-family: sans-serif; |
| 14 | } |
| 15 | |
| 16 | form { |
| 17 | max-width: 900px; |
| 18 | margin-inline: auto; |
| 19 | } |
| 20 | |
| 21 | label, |
| 22 | legend { |
| 23 | font-weight: bold; |
| 24 | } |
| 25 | |
| 26 | fieldset label { |
| 27 | font-weight: normal; |
| 28 | } |
| 29 | |
| 30 | label:has(:not([type="radio"]):required)::before { |
| 31 | content: "✳ "; |
| 32 | } |
| 33 | |
| 34 | label:has(:not([type="radio"]):invalid)::before { |
| 35 | content: "❌ "; |
| 36 | } |
| 37 | |
| 38 | label:has(:not([type="radio"]):invalid:required)::before { |
| 39 | content: "✳ ❌ "; |
| 40 | } |
| 41 | |
| 42 | label output, |
| 43 | label input:not([type="checkbox"], [type="radio"], [type="range"]), |
| 44 | label select, |
| 45 | label textarea { |
| 46 | display: block; |
| 47 | box-sizing: border-box; |
| 48 | width: 100%; |
| 49 | } |
| 50 | |
| 51 | label:has([type="range"]) { |
| 52 | white-space: pre-wrap; |
| 53 | } |
| 54 | |
| 55 | fieldset { |
| 56 | box-sizing: border-box; |
| 57 | } |
| 58 | |
| 59 | fieldset p { |
| 60 | margin-block: 0.5rem; |
| 61 | } |
| 62 | |
| 63 | fieldset label:has(:invalid)::after { |
| 64 | content: "❌"; |
| 65 | } |
| 66 | |
| 67 | legend:has(~p :required)::before { |
| 68 | content: "✳ "; |
| 69 | } |
| 70 | |
| 71 | input[name="temperatura2"] { |
| 72 | writing-mode: vertical-lr; |
| 73 | } |
| 74 | </style> |
| 75 | |
| 76 | </head> |
| 77 | |
| 78 | <body> |
| 79 | |
| 80 | <form id="forma"> |
| 81 | |
| 82 | <h1>Formulario</h1> |
| 83 | |
| 84 | <p> |
| 85 | <label> |
| 86 | Nombre |
| 87 | <output name="nombre">Pp</output> |
| 88 | </label> |
| 89 | </p> |
| 90 | |
| 91 | <p> |
| 92 | <label accesskey="A"> |
| 93 | Apellidos |
| 94 | <input name="apellidos" type="text" placeholder="ej. Pérez López" |
| 95 | required> |
| 96 | <small>Los apellidos de tu familia</small> |
| 97 | </label> |
| 98 | </p> |
| 99 | |
| 100 | <input name="clave" type="hidden" value=""> |
| 101 | |
| 102 | <p> |
| 103 | <label> |
| 104 | Restaurante favorito |
| 105 | <input name="apellidos" type="text" value="La cabaña del Tio Jese"> |
| 106 | </label> |
| 107 | </p> |
| 108 | |
| 109 | <p> |
| 110 | <label> |
| 111 | Número telefónico |
| 112 | <input name="telefono" type="tel"> |
| 113 | </label> |
| 114 | </p> |
| 115 | |
| 116 | <p> |
| 117 | <label> |
| 118 | Número de tarjeta |
| 119 | <input name="tarjeta" type="text" pattern="\d{14,19}" inputmode="numeric"> |
| 120 | <small>14 a 19 letras o caracteres.</small> |
| 121 | </label> |
| 122 | </p> |
| 123 | |
| 124 | <p> |
| 125 | <label> |
| 126 | Sitio personal |
| 127 | <input name="sitio" type="url" list="sitios"> |
| 128 | </label> |
| 129 | </p> |
| 130 | <datalist id="sitios"> |
| 131 | <option>https://facebook.com</option> |
| 132 | <option>https://google.com</option> |
| 133 | <option>https://tiktok.com</option> |
| 134 | <option>https://youtube.com</option> |
| 135 | </datalist> |
| 136 | <p> |
| 137 | <label> |
| 138 | Email para quejas |
| 139 | <input name="quejas" type="email"> |
| 140 | </label> |
| 141 | </p> |
| 142 | |
| 143 | <p> |
| 144 | <label> |
| 145 | Match |
| 146 | <input name="match" type="password" required pattern="\w{4,7}"> |
| 147 | </label> |
| 148 | <small>4 a 7 letras o caracteres.</small> |
| 149 | </p> |
| 150 | |
| 151 | <p> |
| 152 | <label> |
| 153 | Próximo día festivo |
| 154 | <input name="proximo" type="date"> |
| 155 | </label> |
| 156 | </p> |
| 157 | |
| 158 | <p> |
| 159 | <label> |
| 160 | Próximo día libre |
| 161 | <input name="libre" type="date" value="2025-02-14" min="2025-01-01" |
| 162 | max="2025-06-01" step="2"> |
| 163 | </label> |
| 164 | </p> |
| 165 | |
| 166 | <p> |
| 167 | <label> |
| 168 | Mes |
| 169 | <input name="mes" type="month" value="2025-04" min="2025-01" max="2025-12" |
| 170 | step="3"> |
| 171 | </label> |
| 172 | </p> |
| 173 | |
| 174 | <p> |
| 175 | <label> |
| 176 | Semana de vacaciones |
| 177 | <input name="vacaciones" type="week" value="2025-W05" min="2025-W01" |
| 178 | max="2025-W54" step="2"> |
| 179 | </label> |
| 180 | </p> |
| 181 | |
| 182 | <p> |
| 183 | <label> |
| 184 | Hora de la reunión |
| 185 | <input name="horaReunion" type="time" value="15:30" min="07:00" |
| 186 | max="17:30" step="1800"> |
| 187 | </label> |
| 188 | </p> |
| 189 | |
| 190 | <p> |
| 191 | <label> |
| 192 | Fecha y hora local |
| 193 | <input name="nacimiento" type="datetime-local" value="2025-03-18T15:00" |
| 194 | min="2025-01-01T10:00" max="2025-12-31T22:00" step="3600"> |
| 195 | </label> |
| 196 | </p> |
| 197 | |
| 198 | <p> |
| 199 | <label> |
| 200 | Altura |
| 201 | <input name="altura" type="number" min="0.5" max="3.0" step="0.01"> |
| 202 | </label> |
| 203 | </p> |
| 204 | |
| 205 | <p> |
| 206 | <label> |
| 207 | Temperatura |
| 208 | -50 <input name="temperatura" type="range" min="-50" max="80" step="10" |
| 209 | value="20"> 80</label> |
| 210 | </p> |
| 211 | |
| 212 | <p> |
| 213 | <label> |
| 214 | Temperatura 2 |
| 215 | -50 |
| 216 | <input name="temperatura2" type="range" min="-50" max="80" |
| 217 | value="20" list="temperaturas"> |
| 218 | 80</label> |
| 219 | </p> |
| 220 | <datalist id="temperaturas"> |
| 221 | <option value="-50">Congelado</option> |
| 222 | <option value="-30"></option> |
| 223 | <option value="0"></option> |
| 224 | <option value="30"></option> |
| 225 | <option value="50"></option> |
| 226 | <option value="80">Quemándose</option> |
| 227 | </datalist> |
| 228 | <p> |
| 229 | <label> |
| 230 | Color |
| 231 | <input name="color" type="color" colorspace="limited-srgb" value="#00ff00"> |
| 232 | </label> |
| 233 | </p> |
| 234 | |
| 235 | <p> |
| 236 | <label> |
| 237 | Tarea |
| 238 | <input name="tarea" type="file" accept="image/*,application/pdf"> |
| 239 | </label> |
| 240 | </p> |
| 241 | |
| 242 | <p> |
| 243 | <label> |
| 244 | <input name="aprobado" type="checkbox"> |
| 245 | Aprobado |
| 246 | </label> |
| 247 | </p> |
| 248 | |
| 249 | <fieldset> |
| 250 | <legend>Pasatiempos</legend> |
| 251 | <p> |
| 252 | <label> |
| 253 | <input type="checkbox" name="pasatiempos[]" value="fut"> |
| 254 | Futbol |
| 255 | </label> |
| 256 | </p> |
| 257 | <p> |
| 258 | <label> |
| 259 | <input type="checkbox" name="pasatiempos[]" value="chess" checked> |
| 260 | Ajedrez |
| 261 | </label> |
| 262 | </p> |
| 263 | <p> |
| 264 | <label> |
| 265 | <input type="checkbox" name="pasatiempos[]" value="basket" checked> |
| 266 | Basketbol |
| 267 | </label> |
| 268 | </p> |
| 269 | </fieldset> |
| 270 | |
| 271 | <fieldset> |
| 272 | <legend>Madrugador</legend> |
| 273 | <p> |
| 274 | <label><input type="radio" name="madrugador" value="si" checked>Si</label> |
| 275 | <label><input type="radio" name="madrugador" value="no">No</label> |
| 276 | </p> |
| 277 | </fieldset> |
| 278 | |
| 279 | <fieldset> |
| 280 | <legend>Tamaño</legend> |
| 281 | <p> |
| 282 | <label> |
| 283 | <input type="radio" name="tamano" value="grande" required> |
| 284 | Grande |
| 285 | </label> |
| 286 | </p> |
| 287 | <p> |
| 288 | <label> |
| 289 | <input type="radio" name="tamano" value="mediano"> |
| 290 | Mediano |
| 291 | </label> |
| 292 | </p> |
| 293 | <p> |
| 294 | <label> |
| 295 | <input type="radio" name="tamano" value="chico"> |
| 296 | Chico |
| 297 | </label> |
| 298 | </p> |
| 299 | </fieldset> |
| 300 | |
| 301 | <p> |
| 302 | <label> |
| 303 | Género Musical |
| 304 | <select name="generoMusical" required> |
| 305 | <option value="">Sin selección</option> |
| 306 | <option value="pop">Pop</option> |
| 307 | <option value="reg">Reguetón</option> |
| 308 | </select> |
| 309 | </label> |
| 310 | </p> |
| 311 | |
| 312 | <p> |
| 313 | <label> |
| 314 | Géneración |
| 315 | <select name="generacion" value="Z"> |
| 316 | <option value="boom">Baby Boom</option> |
| 317 | <option value="X">X</option> |
| 318 | <option value="">Sin selección</option> |
| 319 | <option value="Y">Millenoals</option> |
| 320 | <option value="Z">Z</option> |
| 321 | <option value="alfa">Alfa</option> |
| 322 | </select> |
| 323 | </label> |
| 324 | </p> |
| 325 | |
| 326 | <p> |
| 327 | <label> |
| 328 | Género |
| 329 | <select name="genero"> |
| 330 | <option value="masculino">Masculino</option> |
| 331 | <option value="femenino" selected>Femenino</option> |
| 332 | <option value="">-- Seleccionar --</option> |
| 333 | <optgroup label="Otros"> |
| 334 | <option value="nodecir">Prefiero no decirlo</option> |
| 335 | <option value="nobinario">No binario</option> |
| 336 | </optgroup> |
| 337 | </select> |
| 338 | </label> |
| 339 | </p> |
| 340 | |
| 341 | <p> |
| 342 | <label> |
| 343 | Bebidas |
| 344 | <select name="bebidas[]" multiple size="3"> |
| 345 | <option value="cafe" selected>Café</option> |
| 346 | <option value="agua" selected>Agua</option> |
| 347 | <option value="limonada">Limonada</option> |
| 348 | </select> |
| 349 | </label> |
| 350 | </p> |
| 351 | |
| 352 | <p> |
| 353 | <label> |
| 354 | Mi camino desde casa |
| 355 | <textarea name="camino" required rows="10" cols="25"></textarea> |
| 356 | </label> |
| 357 | </p> |
| 358 | |
| 359 | <p> |
| 360 | <label> |
| 361 | Mi opinión sobre la comida mexicana |
| 362 | <textarea name="opinion" rows="10" cols="25">Es muy rica</textarea> |
| 363 | </label> |
| 364 | </p> |
| 365 | |
| 366 | <p><small>✳ Obligatorio</small></p> |
| 367 | |
| 368 | <p> |
| 369 | <button type="submit">Procesar</button> |
| 370 | <button type="reset">Reiniciar</button> |
| 371 | </p> |
| 372 | |
| 373 | </form> |
| 374 | |
| 375 | </body> |
| 376 | |
| 377 | </html> |
Formularios en https://html.spec.whatwg.org/multipage/forms.html#forms