ACC-013
Hard constraint
layer: document
Allow enough reading and response time
IF content disappears or a task times out, THEN let users extend, pause, resume, or retrieve it unless a documented safety or real-time exception applies ELSE retain.
Why the rule exists
People read, understand, and respond at different speeds.
Condition
The rule fires when this evaluates true. Paths marked below must be present in the fact base; the engine reports the rest rather than guessing them.
- experience.time_limit.exists eq true
Facts this rule reads
| Path | Source |
|---|---|
experience.time_limit.exists |
You supply it |
Then
- provide — target
experience.time_control - document — target
experience.exception
Else
- retain — target
current_text, No triggering condition is present.
LAKA
- Smallest sufficient intervention
- Yes
- Primary axes
Sources
-
Web Content Accessibility Guidelines 2.2 — W3C
link
Testable accessibility requirements for web content.
The raw rule record
Verbatim from 17-accessibility-rules.json. Also available at /v1/rules/ACC-013.
{
"id": "ACC-013",
"name": "Allow enough reading and response time",
"domain": "accessibility",
"layer": "document",
"strength": "hard_constraint",
"human_logic": "IF content disappears or a task times out, THEN let users extend, pause, resume, or retrieve it unless a documented safety or real-time exception applies ELSE retain.",
"when": {
"path": "experience.time_limit.exists",
"operator": "eq",
"value": true
},
"then": [
{
"action": "provide",
"target": "experience.time_control",
"options": [
"extend",
"pause",
"resume",
"retrieve"
]
},
{
"action": "document",
"target": "experience.exception",
"when": "essential_time_limit"
}
],
"else": [
{
"action": "retain",
"target": "current_text",
"reason": "No triggering condition is present."
}
],
"unless": [],
"because": "People read, understand, and respond at different speeds.",
"diagnostics": [],
"examples": {},
"source_ids": [
"WEB-007"
],
"laka": {
"smallest_sufficient_intervention": true,
"primary_axes": [
"scope",
"depth",
"magnitude",
"reversibility"
]
}
}
Other accessibility rules
- ACC-001 Use clear words for the actual audience IF a simpler word is equally accurate, respectful, and familiar, THEN use it ELSE retain the necessary precise term with support. Context default
- ACC-002 Simple tense and voice when possible IF present active construction expresses the real time and actor, THEN prefer it ELSE use the tense and voice accuracy requires. Context default
- ACC-003 No nested double negatives IF a double negative or negative inside another condition obscures polarity, THEN rewrite with one explicit positive or negative operation ELSE retain a necessary legal distinction with explanation. Hard constraint
- ACC-004 Separate each instruction IF multiple actions appear in one block and can be completed separately, THEN make each a separate step ELSE retain a single compound action. Context default
- ACC-005 Explain implied meaning when consequential IF humor, irony, metaphor, convention, or context carries a consequential instruction or conclusion, THEN state the literal meaning too ELSE retain. Hard constraint
- ACC-006 Headings and labels are unique and descriptive IF repeated or vague headings prevent out-of-context identification, THEN rename them by topic or task ELSE retain. Hard constraint
- ACC-007 Text alternatives convey function or information IF meaningful non-text content appears, THEN provide a concise equivalent of its purpose and relevant information; IF decorative, mark it ignorable ELSE block release. Hard constraint
- ACC-008 Do not encode meaning by color alone IF color distinguishes status, category, instruction, or error, THEN add text, shape, icon, pattern, or position with an accessible label ELSE retain. Hard constraint