Search the site’s resources

A single starting point to find the method, source or situation relevant to your question.

Find a method for your task

All words must match, regardless of case or accents. Search stays in the selected language.

From two characters: use arrows to choose, Enter to open, Escape to close. You can also submit the full search.

1682 results

Clear filters

Guide
Language tags: script, region and publication country are distinct
A BCP 47 tag identifies content language and may include script, region or a variant. It does not identify author nationality or server country. These examples come from RFC 5646; x-default is a separate hreflang convention.
Guide
WCAG 2.2: distinguish target size, focus and conformance level
State the WCAG version and intended level before assessing a journey. The numbers 24 and 44 refer to CSS pixels, not physical screen pixels. These checks alone do not establish overall conformance.
Guide
JSON-stat: locate a cell before interpreting its value
In a JSON-stat cube, dimension and category order define the meaning of a flattened value array. The official order.json example contains 24 demonstration cells, not economic observations. The last dimension changes fastest.
Guide
GeoJSON: inspect nesting before counting objects
Files with the same number of positions can describe different objects. Geometry type determines array depth. An interior hole is not another municipality, and repeating the closing position does not add a new vertex.
Guide
SPDX: read a license choice without inventing permission
An SPDX expression combines identifiers and operators. Link the declaration to an exact version and scope: repository, package or file. These expressions illustrate syntax; they do not state this website’s license.
Guide
DNS: distinguish aliases, absence and resolution failure
A DNS answer concerns a name, requested type, resolver and time. It does not directly identify a company or legal website owner. Retain the full question and answer sections, not just the displayed IP address.
Guide
IPv4: identify special-purpose space before attributing ownership
These ten ranges come from IANA’s registry, consulted on 2026-10-22; its displayed update date is 2025-10-09. Counts include every address in each block, not usable hosts. An IP address alone establishes neither location nor legal identity.
Guide
Relative links: retain the base and resolution contract
The same relative reference can identify different resources under different bases. RFC 3986 supplies 42 cases using http://a/b/c/d;p?q. These are standard examples, not observed websites. The reader compares strict RFC resolution with the browser’s URL parser.
Guide
UUID: read the version without certifying an identity
A UUID contains 128 bits. In the RFC 9562 variant, four bits indicate its version. The table reproduces published examples from Appendices A and B.1, not identifiers assigned here to companies or documents.
Guide
Population density: check the area in the denominator
Four countries and one observation year: this table preserves the 2023 WDI values retrieved on 23 October 2026. It supports checking a division before comparing territories. Population figures are midyear estimates, not counts taken on the retrieval date.
Guide
Area: convert m², hectares and km² without losing decimals
Changing an area unit does not change the territory measured. A kilometre is one thousand metres, so a square kilometre contains one thousand times one thousand square metres. The table and converter make that square explicit.
Guide
World Bank API: distinguish three dates and recover the unit
A JSON response contains more than a value. The real excerpt below concerns Finnish density in 2023. Its header reports a WDI update on 8 October 2026; this snapshot was retrieved on 23 October. Those three dates answer different questions.
Guide
Autofill: read tokens in the right order
Two addresses in one form can require different values even when the fields have the same name. autocomplete describes a purpose and a field group; it replaces neither the visible label nor validation. These examples illustrate HTML grammar, not collected identities or contact details.
Guide
Form parameters: preserve spaces, plus signs and duplicate names
A parameter list is an ordered sequence of name-value pairs. The same name may occur twice. This tool applies application/x-www-form-urlencoded through URLSearchParams to two single-line values, then parses the result; it submits no form.
Guide
Form field: separate label, help, constraint and error
For a postal code, 00123 can be a string to preserve rather than a quantity to add. Control choice follows the intended meaning. This table gives separate checks for a form review; no single attribute proves that an application is valid or that the whole journey conforms.
Guide
Text contrast: compare the ratio before rounding
Different colours can still be difficult to distinguish. WCAG 2.2 compares their relative luminances after linearising the sRGB components. This tool calculates that ratio for two opaque colours; it does not sample pixels from a photograph.
Guide
CSS framing: measure what cover clips and contain leaves empty
The same thumbnail box can show different parts of an image depending on its fit. Both modes preserve aspect ratio but satisfy opposite constraints. This explorer calculates a centred geometric model from already oriented dimensions.
Guide
Exif orientation: eight arrangements, not just four rotations
The Orientation tag, identifier 274 (0x0112), specifies where the first row and first column of encoded data appear on the display. Some values require mirroring. The diagrams reuse one asymmetric shape and four corners marked A, B, C and D; they do not depict an edited photograph.
Guide
Volume and throughput: state the units before estimating a transfer
The same number describes different volumes in GB and GiB. To prepare migration or recovery, first convert the size to bytes and throughput to bits per second. The calculator then gives an arithmetic duration at constant throughput, not a network measurement.
Guide
Recovery: connect RPO, RTO and business-process interruption
An exercise may recover recent files yet restore service too late. It may also restore service quickly using data that is too old. This reader compares three distinct measurements against three user-entered objectives; its numbers are teaching examples, not commitments by this site.
Guide
Recovery exercise: connect each conclusion to evidence
A successful copy log, a matching digest and a usable application answer different questions. This table adapts the NIST guide’s data and functionality validation stages to a multilingual website. It describes evidence to produce during an exercise; it does not claim those tests were performed on your hosting.
Guide
ORCID: check the digit without assigning an identity
An ORCID retains leading zeros and encodes neither country, institution nor discipline. Its last position checks transcription. The examples below are published by ORCID; they are not identities that a reader may claim.
Guide
ROR: decode the checksum without inferring an organisation
A ROR identifier is a random string with no information about the institution or its relationships. Its preferred form is a full URL. The documentation uses 02mhbdp94 as an example; this reader exposes the conversion before checking the digits.
Guide
LEI: separate format, modulo-97 remainder and digit warning
A LEI may contain twenty characters yet fail the transcription check. The XBRL taxonomy also distinguishes an arithmetic error from a warning about certain endings. The example uses the LEI displayed by GLEIF for the foundation itself without inferring its current status.

Choose a starting point

Choose a method

Start from a task: verify, compare, document or decide.

Check a source

Examine the origin, date, scope and limits of information.

Understand a term

Find definitions before applying a protocol.

How can I refine the search?

Start with the topic: Enter one or two specific terms: citation, CSV or provenance. Every word must be present, so a long sentence can exclude useful pages.
Broaden before filtering: Search all families first. Then select a guide, protocol or source according to the kind of answer you need.
Try different wording: Try a synonym or a term in the selected language. Quotes, OR and asterisks are not search operators.

DEEPER READING / PRACTICE

Turn internal search into a useful user journey

A query produces several close results. Reading should help to distinguish the need definition folder, detailed method and implementation tool.

Updated on 2026-10-21.

Priority checks

Formulate a specific need and then try neighboring terms. Read the descriptions and select the type of resource according to the searched step: understand, run or control.

Interpretation pitfalls

The first result is not always the best document to the context. An absence can come from the vocabulary used rather than a lack of content.

Working record to retain

A short route connects a need definition page, a guide and a checklist. Maintaining unresolved questions helps to rebuild research.

PRACTICAL CASE / WORKED EXAMPLE

A natural requirement does not match the exact title

The following case illustrates an approach to defining the need. Situations are pedagogical: they serve to examine the choices and conditions of success, without describing a fulfilled mission or announcing a guaranteed result.

Example context

A reader is looking for how to check a number, while the resources use the word indicator. The results must allow to continue despite a different formulation of the title.

Suggested approach

Try the neighboring terms and read the descriptions. Differentiate methods of calculation, comparison and verification of sources. Choose the resource that corresponds to the actually sought-by-step.

Conclusion and next step

Research becomes a path of solution. The questions still open serve to clarify the next query instead of multiplying the words without clear intention.

Questions for deeper practice

How do you improve a search without losing the initial need?

Keep the starting question and then specify the object, operation and resource type. Useful results give a complementary vocabulary, but their title should not automatically replace the reader's target.

DETAILED WORKSHOP / APPLICATION

Refine a query for the task to carry out

01 / Prepare the necessary information
Describe the initial question and the desired result. Identify the object, operation and type of resource that could help: file, method or tool.
02 / Carry out the approach
Try a formulation and read the descriptions. Release the useful terms and test the variants without giving up the intention. Compare the resources found according to their contribution to the route.
03 / Examine an alternative situation
If the results are close but too general, specify the operation or scope. A well-classed page is not necessarily the one that meets the searched step.
04 / Decide on the next step
Research is useful when it leads to a resource whose response can be identified. Open questions are used to prepare for the next consultation.
05 / Hand over the verification records
Keep a short track with request, resource and supplement. The reader can restart his work without repaired the tests that have led to useful content.

ANNOTATED WORKING DOCUMENT / REVIEW GRID

A track record from a request

The note retains question, tried formulations, useful results and next resource. It distinguishes the exploration vocabulary from the initial goal of the reader.

On a small screen, scroll the grid horizontally to read all three columns.

Example situations to assess
Observation	Supported interpretation	Next step
A resource responds to the desired operation.	The result can serve as a useful step in the course.	Keep the passage and choose the necessary supplement.
The results remain general despite the good topic.	The request must specify action, object or scope.	Try an appropriate formulation without losing the initial question.
The first result has the word but not the answer.	The presence of the term does not prove its relevance.	Read the descriptions and compare the contribution of resources.

Reviewing the working document

The final verification verifies that each step reduces an open question. A link list is not yet a useful path if the reader cannot explain what each page brings.

REPORTING / EXAMPLE WORDING

Presentation of results: Turn internal search into a useful user journey

Point to clarify

A search result must be judged according to its contribution to the searched operation.

Before handing over

Check that the track keeps the initial question despite the vocabulary variants.

Example of a qualified conclusion

The resource selected meets the described stage of the need. The questions still open guidelines the next consultation and remain distinct from the answer found.