Results for “Form behavior”
Small, practical examples. Search by task or narrow things down below.
Limit a numeric input to an inclusive range
HTML: Number inputs expose range validation separately from the entered text.
HTML✓ Tested
Limit typed text to a maximum length
HTML: Maxlength limits ordinary user editing without replacing server-side validation.
HTML✓ Tested
Link a document’s alternate language version
HTML: Use hreflang on an alternate link to declare the language of another page.
HTML✓ Tested
Link to a page section
Use a fragment link to target an HTML section on the same page.
HTML✓ Tested
Link to a section on the same page
HTML: Learn how to link to a section on the same page in a complete browser example.
HTML✓ Tested
List distinct values
Remove duplicate category values from a result.
DISTINCT✓ Tested
List running processes
Display process IDs, parent process IDs, and command names for all visible processes.
process✓ Tested
List unordered pairs without duplicate reversals
SQL: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
SQL✓ Tested
List unordered pairs without duplicate reversals
SQL Server: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
SQL Server✓ Tested
List unordered pairs without duplicate reversals
Postgres: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
Postgres✓ Tested
List unordered pairs without duplicate reversals
SQLite: Join using an increasing key comparison to omit self-pairs and reversed duplicates.
SQLite✓ Tested
Make a pair of columns unique together
SQL: A composite primary key permits repeated individual values while forbidding a duplicate combination.
SQL✓ Tested