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Herramientas HTML

Constructor de estrategia de carga de script

Genera etiquetas script con la estrategia correcta — normal, defer, async o type module.

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Qué es Constructor de estrategia de carga de script?

Constructor de estrategia de carga de script es una herramienta de navegador para esta tarea: Genera etiquetas script con la estrategia correcta — normal, defer, async o type module. La salida es fácil de revisar antes de usarla en un sitio publicado.

Quick answer

Choose a script loading strategy based on when the script must execute. Use defer for scripts that need the full DOM but can download in parallel. Use async for independent scripts like analytics. Use type='module' for modern ES module code.

Limitations

  • defer preserves script execution order; async does not. Choose based on whether script order matters.
  • async scripts execute as soon as they finish downloading, which can block rendering if the script is large.
  • type='module' scripts are deferred by default and do not need an additional defer attribute.

Cómo usar esta herramienta

  1. Abre la herramienta y escribe los valores necesarios.
  2. Revisa la salida en el panel de resultado.
  3. Copia solo la parte que encaja con tu página.
  4. Prueba el cambio antes de publicar.

Para qué puedes usarla

  • Resolver tareas repetidas de publicación con menos fricción.
  • Preparar marcado, CSS o checklists antes del lanzamiento.
  • Evitar pequeños errores comunes en sitios estáticos.

Errores comunes

  • Copiar la salida sin revisarla.
  • Usar URLs locales en lugar de URLs públicas finales.
  • No confirmar que el archivo esté en la carpeta publicada.

Verification

  1. Open Chrome DevTools Network panel and check the Initiator and Waterfall columns to confirm when each script starts loading and executing.
  2. Test page rendering and interactivity timing with different strategies using the Performance panel.

Comparison

async vs defer vs type="module"

Aspectasyncdefertype="module"
Execution timingExecutes as soon as the script finishes downloading, before DOMContentLoadedExecutes after HTML parsing is complete, just before DOMContentLoadedExecutes after HTML parsing is complete, same as defer behavior
Script order guaranteeNo. Scripts execute in the order they finish downloading.Yes. Scripts execute in the order they appear in the HTML.Yes. Scripts execute in the order they appear, same as defer.
Blocks HTML parsingDoes not block HTML parsing. Downloads in parallel.Does not block HTML parsing. Downloads in parallel.Does not block HTML parsing. Downloads in parallel.
Use casesIndependent scripts such as analytics, A/B testing, or social widgetsScripts that need the full DOM such as app bundles that query or modify the pageModern ES module code where import/export syntax is used
Default behavior without attributeWithout any attribute, the script blocks HTML parsing until it downloads and executesN/Atype="module" scripts are deferred by default and do not need an explicit defer attribute

Async downloads in parallel and runs on completion. Defer downloads in parallel but waits for the HTML to finish parsing. Module scripts are deferred by default and support ES module dependency graphs.

FAQ

Preguntas sobre Constructor de estrategia de carga de script

Constructor de estrategia de carga de script funciona localmente?

Si. Las herramientas actuales están pensadas para generar salida en el navegador.

Debo probar el resultado?

Si. Revisa siempre la salida en tu plantilla, navegador y hosting.

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