AdvancedAccessibility Topics
“Progress over Perfection”
PDFTagging & Remediation
Tags are the hidden structure that makes a PDF perceivable and operable for assistive technology, and most PDFs in daily school use are missing them entirely.
Spotting the Problem
- Untagged PDF: Exported without a tag structure. Text may be selectable, but a screen reader announces no headings, no reading order, and no list or table structure
- Scanned PDF: A photograph or scan saved as a PDF. There is no real text at all, only an image; a screen reader reads nothing, and sighted users cannot search or resize the text
- Quick select-text test: Open the PDF and try to highlight a sentence. If nothing selects, it is a scan or an image-only page
- Quick structure test: In Acrobat, open the Tags panel (View > Show/Hide > Navigation Panes > Tags). No tags tree, or a single generic <Sect> wrapping everything, means the document needs remediation
Tagging Fundamentals
- Heading tags: <H1>-<H6> give the document a navigable outline, the same way heading styles do in Word
- Reading order: The order tags appear in the tag tree is the order a screen reader announces content, which can differ from the order it appears visually on the page
- Alt text tags: Every meaningful <Figure> tag needs alternate text; purely decorative images should be tagged as artifacts so screen readers skip them
- Table header tags: <TH> cells with a scope attribute let a screen reader announce which header applies to each data cell
- List tags: <L>, <LI>, <LBody> announce "list, 5 items" instead of reading bullet characters as plain text
- Form field labels and tab order: Fillable PDF forms need a label tied to each field and a tab order that matches the visual layout, not the order fields were drawn
Fix at the Source
- Always remediate the original file first: Fix headings, alt text, and table structure in the source Word, Google Docs, or InDesign file, then re-export to PDF. A properly tagged source file usually exports a mostly-tagged PDF automatically
- Only patch the PDF directly when there is no source file: For an old scanned form or a document whose original was lost, Acrobat's manual tagging tools (covered on the next page) are the only option
PDFTagging & Remediation
Acrobat Pro: Step by Step
- Run the Accessibility Checker: Tools → Prepare for Accessibility → Full Check. It sorts results into Errors, Warnings, and items marked "Needs manual check," each with a right-click "Fix" option where one exists
- Autotag Document: Tools → Prepare for Accessibility → Autotag Document generates a first-pass tag tree from an untagged PDF. Treat this as a starting point, not a finished result: always verify heading levels and table structure afterward
- Reading Order tool: Tools → Prepare for Accessibility → Reading Order opens a visual overlay for drawing and re-ordering content regions directly on the page, and for applying tags (Heading, Table, Figure) by region
- Tags panel manual fixes: View → Show/Hide → Side Panels → Tags lets you retitle a tag, change a heading level, add or edit alt text on a Figure tag, and drag tags into the correct order
PAC: A Second Opinion
- What it is: PAC (PDF Accessibility Checker) is a free, independent tool that checks a PDF against the PDF/UA standard, useful for confirming an Acrobat fix actually resolved the underlying tag problem
- Reading the report: PAC groups findings by WCAG/PDF-UA checkpoint (document structure, tagging, tables, alt text) rather than by page, so start with any item flagged as a failure before reviewing warnings
- Common PAC failures and their Acrobat fix: "Document is not tagged" → run Autotag; "Heading levels are skipped" → fix in the Tags panel; "Table lacks header cells" → use the Reading Order tool's Table tag, then set header rows
Most Common PDF Errors
Scanned-Only PDF With No Source File
A permission slip or form that only exists as a yearly photocopy scan has no text a screen reader can read at all. Fix: Recreate the form in Word or Google Docs with real headings and labeled fields, then export a tagged PDF from that source. Keep the editable file for next year.
Missing or Incomplete Tags
A PDF exported from an untagged or poorly structured source document carries that same lack of structure into the PDF. Fix: Add headings and alt text in the source file first, re-export, and confirm with the Accessibility Checker before treating the file as done.
Untagged Tables
A table that displays correctly but was built with tabs and spacing instead of a real table object exports with no row/column structure a screen reader can announce. Fix: Rebuild the table using the Insert Table tool in the source file, or use Acrobat's Reading Order tool to manually apply Table and TH tags with the correct scope.
SpreadsheetAccessibility
Budget sheets, grade exports, and data trackers built in Excel or Google Sheets follow the same accessibility rules as any other document: real structure, clear labels, and no reliance on color alone.
Header Rows & Navigation
- Freeze and repeat header rows: In Excel, use View > Freeze Panes so column headers stay visible while scrolling, and set Page Layout > Print Titles so the header row repeats on every printed page
- Label headers as headers: In Google Sheets, select the header row and use View > Freeze > 1 row, and consider Format > Alternating colors so screen magnifier and low-vision users can track rows more easily
- One header row per sheet: A screen reader announces the header row when a user moves down a column with Ctrl+Alt+Arrow keys (Excel) only if that row is set as the actual header, not just bolded text
Named Ranges & Formulas
- Use named ranges for key data blocks: A range named "Q2_Enrollment" is easier to navigate and audit with a screen reader than "B4:F19," and makes formulas readable instead of a wall of cell references
- Keep formulas simple and documented: A cell comment or an adjacent notes column explaining what a formula calculates helps every user verify the sheet, not only assistive-technology users
Structure & Layout
- Avoid merged cells inside a data range: Merged cells break the row/column association a screen reader relies on to announce "which header goes with this cell." Reserve merging for a standalone title above the data, never within it
- Name every sheet tab descriptively: "Q2 Enrollment" is announced clearly when a screen reader user tabs through sheets; "Sheet3" is not
- Add alt text to embedded charts: Right-click a chart > Edit Alt Text (Excel) or Alt text under the chart's three-dot menu (Sheets) and describe the trend the chart shows, not just "bar chart"
- Do not rely on color-only conditional formatting: A red/green pass-fail highlight communicates nothing to a colorblind user or a screen reader. Pair it with a text label or icon, such as a "Pass"/"Fail" column
Captioning& Transcript Workflow
Auto-generated captions are a starting draft, not a finished product. This page covers producing usable caption files and transcripts, beyond simply turning captions on.
Caption File Basics: SRT vs. VTT
- SRT (SubRip): The most widely supported caption format. Each block is a number, a start/end timestamp (
00:00:05,000 --> 00:00:08,500), and the caption text. Works with most video players and LMS uploads - VTT (WebVTT): The web-native format, required for HTML5
<track>elements and preferred by most modern video platforms. Similar structure to SRT, with aWEBVTTheader line and period-separated timestamps - Which to use: If a platform accepts either, VTT supports more features (styling, positioning); use SRT only when a specific tool requires it
Editing Auto-Generated Captions
- Always review before publishing: Auto-captions frequently misstate student names, subject-specific vocabulary, and acronyms; never post a video relying on unreviewed auto-captions
- Fix homophones and technical terms first: These are the most common auto-caption errors and the most disruptive to meaning
- Add speaker labels for multi-speaker video: "Ms. Rivera:" before her lines helps viewers follow a panel, interview, or recorded meeting
- Add sound description tags where meaning depends on them: [bell rings], [applause], [video clip plays] when the sound itself carries information
Transcript Formatting
- Identify each speaker by name: A transcript without speaker labels is difficult to follow for any reader, not only screen reader users
- Break paragraphs by topic or speaker turn: Long unbroken blocks of transcript text are hard to scan and navigate
- Include periodic timestamps: Timestamps every minute or two let a reader jump to a specific point without scrubbing through video
- Post the transcript alongside the video, not instead of captions: Captions and transcripts serve different needs; provide both whenever possible
Tooling
- YouTube Studio: Subtitles tab lets you edit auto-generated captions line by line, adjust timing, and download as SRT or VTT
- Google Docs voice typing / Word Transcribe: Both can generate a first-pass transcript from an audio or video file that you then review and correct
- Google Meet / Zoom recordings: Both platforms can auto-generate a transcript alongside a recording; review it the same way as any auto-caption before sharing
Alt TextDecision Framework
Good alt text is not one-size-fits-all. Every image falls into one of four categories, and each category calls for a different kind of description, or none at all.
The Four-Way Decision
- Decorative: Adds visual interest only and carries no information (a border flourish, a stock background photo). Mark it with an empty alt attribute (
alt="") so a screen reader skips it entirely, rather than announcing "image" and wasting the listener's attention - Informative: Conveys content a reader needs (a photo of student work, a diagram of a process). Write a concise description of what the image shows and why it is there
- Functional: The image acts as a control (a linked icon, a button graphic). Describe the action the image performs, such as "Submit form" or "Open the district calendar," not the image's appearance
- Complex: Charts, graphs, infographics, and diagrams that carry more information than a short phrase can capture. These need a long description in addition to a brief alt attribute; covered in full on the next page
Decision-Flow Questions
- Would removing this image lose any information? If no, it is decorative; use an empty alt attribute
- Does clicking or activating this image do something? If yes, describe the action, not the picture
- Could someone summarize this image in one short sentence? If yes, that sentence is your alt text
- Does the image contain data, relationships, or steps that a sentence cannot capture? If yes, treat it as complex and add a long description
Common Alt Text Mistakes
Starting With "Image Of" or "Picture Of"
A screen reader already announces "image" before reading the alt text, so restating it wastes every listener's time. Fix: Start directly with the content. "Image of students in the library" becomes "Students working at library tables."
Repeating the Caption Word for Word
When a visible caption already describes the image, identical alt text forces a screen reader user to hear the same sentence twice.
Fix: If a caption fully describes the image, mark the image decorative (alt="") so it is not announced a second time.
Keyword-Stuffing for Search Engines
Cramming extra keywords into alt text to help a website rank in search results produces a confusing, run-on description for anyone using a screen reader. Fix: Write alt text for the person listening, not for a search algorithm. Accurate, concise description serves both purposes better than keyword stuffing.
Alt TextDecision Framework
Complex images carry more information than a one-sentence alt attribute can hold. They still need a short alt text for identification, plus a separate long description for the details.
Complex Image Types
- Charts and graphs: Bar, line, and pie charts encode data through position, length, or color that a short phrase cannot fully capture
- Infographics: Multi-part visuals combining icons, short text, and layout to tell a sequence or comparison
- Diagrams: Flowcharts, cycle diagrams, and labeled technical drawings where relationships between parts carry the meaning
- Screenshots of software or web pages: An interface screenshot used in a how-to guide often shows several buttons, menus, or fields at once
Long-Description Techniques
- Adjacent visible text or caption: The simplest option; write the full description as regular text or a caption directly next to the image, visible to every reader, not only screen reader users
- Data table as the equivalent: For a chart, provide the same numbers in a simple data table nearby (or in an appendix); this also serves any reader who wants exact values rather than a visual trend
- Linked long description: For a document that must stay visually clean, a "Full description" link pointing to an appendix page or a separate document works, provided the link text says exactly what it opens
aria-describedby(web content only): Points a screen reader to a second block of text elsewhere on the page that contains the long description; not available in Word or PDF, only in HTML
Worked Mini-Examples
- Enrollment bar chart: Alt text: "Bar chart of enrollment by grade, 2021-2025." Long description (as an adjacent data table): grade-by-grade enrollment numbers for each year shown
- Fire-safety flowchart: Alt text: "Flowchart of the fire drill procedure." Long description (as body text below the image): each step written out in the same left-to-right, top-to-bottom order as the diagram
- Gradebook screenshot in a how-to guide: Alt text: "Screenshot of the gradebook Assignments tab." Long description (as numbered steps in the surrounding text): "1. Click Assignments. 2. Select the assignment name. 3. Click Enter Grades," rather than describing the screenshot's pixels
MeetingAccessibility
Staff meetings, School Committee sessions, and public forums carry the same Title II obligations as any other GLTHS communication. This page covers preparing accessible meetings before they happen.
Advance Materials
- Send materials with enough lead time: Agendas, slide decks, and handouts distributed at least a few days ahead give attendees using assistive technology, or anyone needing an alternate format, time to prepare
- Distribute accessible file formats: Tagged Word or PDF documents, not a scanned or photographed agenda; apply the same standards covered in the PDF Remediation and document accessibility pages
- Note the accessible-format request process on every invitation: A simple line such as "Contact [name/email] for materials in an alternate format" signals the option is available before someone has to ask
Interpreter & CART Requests
- Who to contact: Route ASL interpreter and CART (Communication Access Realtime Translation) requests through the district accessibility contact so requests are logged and staffed consistently
- Lead time matters: Interpreters and CART providers are scheduled in advance; request as early as possible, and never assume a request can be filled same-day
- Staff meetings vs. public meetings: Internal staff-meeting requests are typically handled directly by the requester's supervisor and the accessibility contact; School Committee and public-meeting requests follow the district's public-meeting accommodation process and posted timeline
Accessible Agendas & Packets
- Use real headings for each agenda item: A screen reader user should be able to jump directly to item 4 the same way a sighted reader scans down the page
- Never publish an image-only agenda: A scanned or photographed agenda page carries no text a screen reader can read; export from the original Word or Google Doc
- Number and label attachments clearly: "Attachment 3: FY26 Budget Summary" in the file name and in the agenda text, not "attachment_final_v2"
MeetingAccessibility
Captioned Virtual & Hybrid Calls
- Turn on live captions by default for staff meetings: Both Google Meet and Zoom offer built-in live captioning; enabling it as a default habit removes the need for someone to request it in the moment
- Test audio and camera framing before a hybrid meeting starts: Remote attendees using captions or an interpreter need clear audio pickup and, if an interpreter is present, a camera view that keeps them visible throughout
- Share the chat and any shared documents in an accessible format: A screenshot pasted into chat is not accessible; paste text or share a document link instead
School Committee & Public Meetings
- Broadcast and recorded meetings need captions: Any School Committee or public meeting streamed or recorded for later viewing must include captions on the published recording, not only live captions during the event
- Minutes and supporting documents follow the same accessibility rules: Posted minutes, budget documents, and presentation slides need the same heading structure, alt text, and tagging covered elsewhere in this packet
- Post the accommodation request process publicly: Meeting notices should state how a member of the public requests an interpreter, CART, or materials in an alternate format, and by what deadline
Where Title II Meets Open Meeting Law
- Two obligations, one meeting: Open Meeting Law governs notice, minutes, and public access; Title II governs whether that access is actually usable by someone with a disability. Meeting the letter of Open Meeting Law posting requirements does not automatically satisfy Title II if the posted materials are not accessible
- When in doubt, ask early: Route accommodation questions that touch both areas, such as a request to attend remotely with CART, to the district accessibility contact well before the meeting date
Cognitive& Neurodivergent Accessibility
Accessibility is not only about vision, hearing, and motor ability. Dyslexia, ADHD, autism, and other cognitive differences respond to specific, learnable design choices in everyday documents and pages.
Dyslexia-Friendly Typography
- Choose a clear sans-serif font: Fonts with simple, evenly-spaced letterforms are easier to decode than decorative or condensed fonts
- Left-align text instead of justifying it: Justified text creates uneven gaps between words that disrupt the reading rhythm for many dyslexic readers
- Keep line length moderate: Very long lines make it easy to lose your place; a narrower column or added margin helps
- Avoid long blocks of italics or all-capital text: Both are slower to decode than standard sentence case for many readers
- Increase line spacing slightly: 1.5 line spacing gives letters and words room to stay visually distinct
ADHD- & Autism-Friendly Design
- Chunk content into short sections: A page of small labeled sections is easier to process and return to than one long unbroken passage
- Reduce visual clutter: Extra borders, background images, and decorative flourishes compete for attention with the actual content
- Avoid auto-playing motion, video, or audio: Unexpected movement or sound can be distracting or overwhelming; require a deliberate click to start playback
- State what happens next: "This form has 3 sections and takes about 5 minutes" sets expectations before someone starts
Predictable Navigation
- Keep layout and labeling consistent: The same document type should place headings, dates, and action items in the same place every time
- Use the same term for the same thing throughout: Switching between "submit," "send," and "turn in" for the same action adds unnecessary interpretation work
- Signal where a reader is in a multi-step process: A visible "Step 2 of 4" label reduces uncertainty about how much is left
Reducing Cognitive Load
- One idea per sentence, one step per instruction: Combining multiple instructions into a single sentence increases the chance a step gets missed
- Use plain language as the default: The same grade-level writing guidance covered elsewhere in this training also reduces cognitive load, not only reading difficulty
- Favor progressive disclosure over a wall of text: Show the essential information first, with optional detail available a click away for readers who want it
- Build in extended-time accommodation by default where practical: Untimed or generously-timed digital forms and quizzes remove a barrier before anyone has to request it