Blog archive

HTML input pattern: validate a format without blocking users

October 10, 2026•7 min read

Learn how HTML input pattern matches a whole value, handles empty fields, and uses the v flag. Build a local checker with clear, accessible format hints.

htmlform validationaccessibility

HTML datalist vs select: suggestions are not validation

October 9, 2026•6 min read

Learn when to use HTML datalist instead of select. Test free-text values, required validation, form data, and accessibility limits with a working local example.

HTMLFormsAccessibility

HTML URL input validation: accept website links correctly

October 8, 2026•8 min read

Learn what HTML URL inputs validate, add HTTP and HTTPS checks, and test an accessible website field without confusing valid syntax with a safe or working link.

HTMLJavaScriptValidation

HTML form reset: restore defaults and clear stale errors

October 8, 2026•7 min read

Learn what form.reset() restores, why defaults are not empty values, and how to clear custom errors with a working HTML demo and keyboard-friendly feedback.

HTML formsJavaScriptForm validation

HTML select placeholder: make required choices work

October 6, 2026•6 min read

Build an HTML select placeholder that works with required. Test empty options, optgroups, keyboard input, and the exact FormData value in a local checker.

HTMLform validationaccessibility

HTML number input: fix min, max, and step validation

October 4, 2026•7 min read

Fix HTML number input validation with min, max, and step. Test decimals, required values, keyboard errors, and FormData in a complete local quantity checker.

html formsform validationaccessibility

FormData.getAll(): keep every selected form value

October 3, 2026•7 min read

Fix missing checkbox values with FormData.getAll(). Run a complete browser demo, compare JSON conversions, and check repeated fields before sending them.

HTML formsJavaScriptFormDatadebugging

HTML phone number input: type=tel without a restrictive regex

October 2, 2026•8 min read

Build an accessible HTML phone number input with type=tel, autocomplete, and an optional extension. Test what submits and where phone validation belongs.

html formsform validationaccessibility

HTML date inputs: min, max, step, and timezone mistakes

October 1, 2026•7 min read

Build an HTML date input with min, max, and step. Validate a weekly date range, preserve date-only values, and avoid off-by-one timezone mistakes.

HTML formsdate inputsform validationaccessibility

HTML form attribute: include fields outside the form

October 1, 2026•6 min read

Fix missing external form fields with the HTML form attribute. Check form ownership, native validation, keyboard submission, and the exact FormData payload.

HTML formsaccessibilityJavaScriptdebugging

Disabled vs readonly: why form fields go missing

September 29, 2026•7 min read

Learn why disabled fields disappear from HTML form submissions, when readonly keeps a value, and how to inspect the exact payload with a working browser demo.

HTML formsFormDatadebuggingaccessibility