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To verify a revised HTML proposal, compare the approved version with the revision in both reader-visible content and HTML markup, then check every changed price and delivery date against the approved pricing schedule, delivery milestones, and written change authorization. A diff shows what changed; it does not establish that the change is approved or commercially correct.
1. Preserve and identify both proposal versions
Keep the earlier approved proposal and the new file as separate records. Note each filename, version label or date, and where it came from. Do not treat the newest file as approved just because it is the most recent.
Use copies for comparison so the originals remain intact. If the proposal is stored in a document-management or contract system, retain its version history or other record identifying the approved copy.
2. Compare what a reader sees
Start with a text-oriented comparison to locate changed wording, tables, amounts, dates, units, and conditions. Review each difference in context: include the relevant heading, table row, footnote, surrounding language, and any defined terms. A changed number can mean something different depending on whether it is described as a unit rate, total, estimate, or option.
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For a browser-based option, textdiff.io documents both formatted-markup and visible-text comparison modes. The service says its comparison runs in the browser and text is not uploaded; that is the provider’s statement, not an independent security verification. Confirm that any tool you use meets your organization’s data-handling requirements.
3. Inspect the HTML markup and rendered proposal
Visible wording is only one layer. Compare the HTML source or markup for changes to links, attributes, elements, and structure. A displayed price or date may be unchanged even though its link, surrounding context, or presentation has changed. Where the review platform supports it, inspect both source and rendered views.
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GitHub’s documentation on reviewing proposed changes recommends reviewing HTML changes in source and rendered views for completeness, while noting that rendered views of commits to HTML documents are not directly supported. Git patch output can help locate source changes; see Git’s diff documentation. Neither approach determines whether a commercial term is authorized.
Tools compare according to their own rules. For example, the bem/html-differ project describes its comparison criteria and expressly says it does not check HTML validity. A structural comparison, such as the one described by TruTools, can expose changes in element trees, attributes, and text, but should not be treated as a complete visual review or a commercial validation. Treat tool descriptions, including claims about local processing, as vendor statements and assess them against the actual tool and your organization’s requirements.
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4. Verify each changed price and delivery date
Check price in its commercial context
For every changed price, establish what the figure measures and reconcile it with the approved pricing schedule. Check:
- Currency and whether the amount is a unit rate, subtotal, or total.
- Quantity, tax treatment, discounts, and any options.
- Assumptions or conditions that affect the price.
- Whether the revised figure matches an approved change record, contract amendment, or written decision.
Pricing approaches can allocate risk differently; UK government guidance on pricing and sourcing provides context for that issue. Use the schedule and approval applicable to the proposal rather than assuming that two displayed figures are directly comparable.
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Check delivery dates against milestones and conditions
Determine whether each date is a target, milestone, or contractual deadline. Compare it with the approved delivery schedule and check dependencies, delivery location, and conditions that could affect timing. Government guidance on agile digital and IT contracting discusses governance and management of delivery and quality; the proposal’s own approved milestones and terms remain the records to verify for that proposal.
Match both values to written authorization
For each price or date change, locate the record that authorizes it: for example, an approved change request, contract amendment, or written decision from the appropriate authority. A comparison tool can identify a difference, but it cannot authenticate the approval or decide the legal effect of the change.
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5. Record discrepancies and resolve them before relying on the revision
Keep a change log that connects each difference to its location and supporting record. A practical format is:
| Location | Old value | New value | Supporting approval or schedule | Reviewer | Disposition |
|---|---|---|---|---|---|
| Section, page, or table row | Value in approved version | Value in revision | Record and version/date | Name or role | Approved, corrected, or escalated |
If a changed value does not match its schedule or the necessary approval cannot be found, ask the proposal owner or contract manager to resolve the discrepancy before relying on the revision.
What a comparison can—and cannot—establish
- A text comparison helps find changed wording and displayed values.
- A source or structural comparison helps find markup, attribute, link, and element changes that a text-only view may miss.
- A rendered review helps assess how the proposal appears to a reader, where that view is available.
- These methods report differences according to their comparison and normalization rules; they do not, by themselves, prove HTML validity, commercial correctness, approval, or legal effect.
Legal requirements depend on the jurisdiction and contract. In the UK public-procurement context, the Cabinet Office’s Guidance: Contract Modifications, updated 20 July 2026, discusses sections 74–77 and Schedule 8 of the Procurement Act 2023 and the conditions governing modifications to covered public contracts. It says each modification must be considered on its own facts, and that additional goods, services, or works at the original price may not, in particular circumstances, materially change the economic balance in the supplier’s favour. This is jurisdiction-specific public-contract guidance, not a universal rule for private proposals or other countries.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
