WP-C flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Semantic heading order

Headings must descend through levels without skipping, and each page has one h1. Screen readers and search engines use this outline to navigate and understand page structure.

Alt text decision rule

Informative images get a concise description of purpose; decorative images get an empty alt attribute so assistive technology skips them; complex charts need a longer text alternative.

WCAG contrast minimums

Normal text needs a 4.5:1 contrast ratio against its background. Large text at 18pt or 14pt bold needs 3:1, and non-text interface components also need 3:1.

Content inventory disposition

Each inventoried URL is assigned keep, update, merge, redirect, or retire. The disposition drives the migration plan and prevents orphaned or duplicated pages after launch.

301 versus 410

A 301 signals permanent movement to a replacement URL and passes link equity. A 410 signals permanent removal with no replacement, telling crawlers to drop the page.

Descriptive link text

Link text must convey the destination when read alone, because screen-reader users often browse a list of links. Generic phrases like click here fail this requirement.

Mobile viewport meta tag

The viewport tag tells mobile browsers to match the layout width to the device width. Without it, phones render a zoomed-out desktop layout that is unusable.

Title and meta description length

Titles are typically written at 50 to 60 characters and meta descriptions at 150 to 160. Search engines may truncate or rewrite either, so lead with the key message.

Responsive layout units

Relative units such as rem, percentages, and viewport units let layouts and type scale with the user's settings, while fixed pixel widths can cause horizontal scrolling on small screens.

Form label association

Every input needs a programmatically associated label element. Placeholder text is not a label because it disappears on typing and is inconsistently announced by assistive technology.

HTTP status code classes

2xx means success, 3xx means redirection, 4xx means the client made an error, and 5xx means the server failed. The class determines who should act on the response.

Cache-Control max-age

max-age sets how many seconds a response stays fresh in a cache. s-maxage overrides it for shared caches such as CDNs, which is useful for differing browser and edge policies.

Conditional request with ETag

The client sends If-None-Match with a stored ETag. If the resource is unchanged the server replies 304 with no body, saving bandwidth while keeping caches accurate.

HSTS header purpose

Strict-Transport-Security instructs browsers to use HTTPS only for a set period, blocking downgrade attacks. It should be deployed only after HTTPS works on every subdomain.

DNS record types

A maps names to IPv4 addresses, AAAA to IPv6, CNAME creates an alias, MX routes email, and TXT carries verification and email policy records such as SPF.

Core Web Vitals thresholds

Largest Contentful Paint is good at 2.5 seconds or less, Interaction to Next Paint at 200 milliseconds or less, and Cumulative Layout Shift at 0.1 or less.

Staging to production checklist

Back up the database, deploy code, run migrations, smoke-test key templates, confirm redirects, and verify analytics. Skipping any step risks silent breakage after release.

Log triage by URL pattern

Group error logs by route or template rather than individual URL, then compare spikes against deploy timestamps. One broken template can produce thousands of near-identical errors.

Recovery point versus recovery time

Recovery point objective is the maximum acceptable data loss measured in time. Recovery time objective is the maximum acceptable downtime before service is restored.

HTTPS certificate hostname match

A certificate must list the exact hostname served. A mismatch or expired certificate triggers browser warnings that block users, so expiry monitoring is part of routine operations.

Robots.txt versus noindex

Robots.txt blocks crawling of a path, while a noindex meta tag or header blocks indexing of a page. Use noindex to remove a page already indexed.

Uptime monitoring basics

External checks request a key URL at a set interval and alert on status code or response time. Checks should cover the homepage, a deep template, and any critical transaction path.

ROI formula

Return on investment equals gain minus cost, divided by cost, expressed as a percentage. Always state the time period, since annual and multi-year ROI are not comparable.

Total cost of ownership

TCO sums licensing, hosting, implementation labor, training, maintenance, and eventual exit or migration costs. Comparing only purchase prices understates long-term platform expense.

RACI accountability rule

Each task has exactly one Accountable person who owns the outcome. Responsible performs the work, Consulted advises beforehand, and Informed is updated afterward.

SMART goal criteria

A goal must be specific, measurable, achievable, relevant, and time-bound. Without a metric and a deadline, progress cannot be tracked or evaluated objectively.

Budget variance calculation

Variance equals actual minus planned cost. A positive figure on a cost line is an overrun and is usually reported as a percentage of the planned amount for comparability.

Payback period formula

Payback equals initial investment divided by annual net cash inflow. It shows how quickly costs are recovered but ignores all value generated after the breakeven point.

Stakeholder influence-interest grid

Stakeholders are plotted by influence over the project and interest in its outcome. High influence with high interest requires active management and early involvement.

Scope change control process

New requirements are logged, assessed for cost, schedule, and risk impact, then approved or rejected by the sponsor. Approved changes are rebaselined and communicated.

KPI definition requirements

A usable KPI has a target value, a defined data source, an owner, and a review cadence. A metric lacking a threshold cannot trigger a decision or corrective action.

Break-even point

Break-even is the volume at which total revenue equals total cost, calculated as fixed costs divided by contribution margin per unit. Below it, each additional sale reduces losses.