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HTML · 11 The Form Submission Contract

Series contents · Technology map

Stage: Tables and Form Inputs · Editable example · Storage ID: html-step-11

Goals and learning outcomes

Prerequisites

The work and experiment records from Unit 10, “Quotations and Machine-readable Dates”.

Key concepts and explanations

Form Ownership

form groups inputs and submission actions. A button without a type may become a submit button inside a form.

Submission Names

name becomes a key in the submitted data. id is used for associations such as labels and does not replace name.

Practice setup

First check the execution scope guidance on the example screen. The following environment is for extending the assignment in a separate project. Implement it yourself in a separate local project and check it with browser developer tools. Prepare HTML and any necessary image/media files in a separate folder and open them through a local HTTP server. Check with the Elements and accessibility panels and actual keyboard operation.

The linked example is a starting point. It does not implement every task below. Complete work beyond its supported scope in a separate project.

Practice tasks

  1. In form-basics.html, prepare a q input and search/reset actions.
  2. Build a GET search form with a labeled, named input and submit·button buttons.
  3. Run with a q input and search/reset actions. Results to check: The q value appears in the URL after a search. The auxiliary button does not submit the form unintentionally. Record expected and actual results separately.

Variables to observe

VariableBaselineChangeExpected change / hypothesis
Button typebuttonsubmitPre-run hypothesis: Clicking will submit the form. Keep other conditions fixed and record the actual result separately after running.

Predictions in this table are not measured results. Change one condition at a time and record why the actual result differs.

Completion criteria

Self-check

  1. Is an input with only id submitted?
  2. How do the purposes of GET and POST differ?

Official references

Linked example and execution scope

Example source · Runtime environments and limits

This preview calls preventDefault() in the submit event, so the iframe does not navigate. The inspection button and submit handler display validity and FormData from the current DOM. Complete the assignment to inspect the URL after a GET submission on a separate HTTP page. Scope body/html selectors inside Shadow DOM. @media responds to the outer preview viewport, while the width slider changes only the container. Network access, form navigation, and iframe execution are restricted.

Source code and records are not overwritten automatically. Resetting an existing example also preserves your notes.

Next learning

Previous: Quotations and Machine-readable Dates · Next: Input Types and Autocomplete

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