Did you know that enlarging text is not the same as making a digital book easy to read? On one screen, a student increases the font and the sentences wrap neatly. On another, the letters grow but the whole page must be dragged sideways, line after line.
The useful distinction is between reflowable and fixed-layout reading. Reflowable text adjusts its line breaks to the available screen width; fixed-layout pages preserve a designed arrangement. Neither label alone guarantees accessibility. Students and teachers should test whether text can be resized, found, navigated and understood without losing essential diagrams or mathematical notation.
What does ‘reflow’ actually mean?
Imagine pouring water from a wide container into a narrow one: it changes shape to fit. Reflowable digital text behaves similarly. When the reading window becomes narrow or the font grows, words move to new lines while remaining in reading order. A student may see different page boundaries on a tablet and a phone, but the passage is still the same.
A fixed-layout page behaves more like a printed poster. The positions of sentences, captions and images are deliberately retained. That can be appropriate for picture books, comics, worksheets, maps or diagrams where placement conveys meaning. However, if every line stays fixed while the screen shrinks, a reader may need horizontal and vertical movement to follow ordinary prose.
Two connected terms matter: viewport means the visible reading area, and navigation means moving to a chapter, heading or target passage. A reflowable page with broken headings is still inconvenient; a fixed-layout page with clear navigation can sometimes be the better tool for a spatial task.
Worked example 1: reading a Primary English story
Suppose a child receives two versions of a 12-page story. Version A allows the child to increase text size; sentences wrap and the reader can search for the word hesitated. Version B is a scan of printed pages: each page is a large picture, so the child must zoom, slide sideways and guess where the next line starts.
For ordinary prose practice, Version A may be easier to read, search and review. A parent can test it in a minute: increase the font, rotate the screen, search for a known sentence, and navigate back to the correct chapter. If the scan has no searchable text layer, it may be much less practical for independent vocabulary review.
Now add context: hesitated means paused before acting, often because of uncertainty. A child can highlight it, hear it read if the app supports audio, then write “She hesitated at the door because she was unsure.” The reading format has enabled a learning action, not just a visual preference.
Worked example 2: Science and Mathematics need spatial layout
A Secondary Science page may contain a circuit diagram with labels and arrows. A Mathematics question may include a graph, axis markings and an equation. Rearranging these elements without preserving their relationships could make the lesson harder, not easier. A useful resource therefore keeps diagrams readable and includes meaningful text explanations or alternatives where possible.
For an ordinary paragraph explaining a circuit, reflow is helpful. For the circuit drawing itself, the reader may need zoom, clear labels and a description of components and connections. The goal is not to force every object into one vertical column. It is to let the learner access the meaning.
This distinction matters across Primary English and Science, Secondary G1/G2/G3 subject reading, technical training and adult work manuals. Vocabulary such as caption, legend, axis, alternative text and reading order tells us how different parts of a document contribute meaning.
A four-part reading-format check
- Text: Can the reader select, enlarge and search words? Does ordinary prose wrap within the screen instead of requiring continuous sideways scrolling?
- Structure: Can the student use a table of contents, headings or bookmarks? Does the reading order remain logical?
- Meaning: Are figure labels, units, footnotes and hyperlinks understandable? Are important diagrams supported with descriptions where appropriate?
- Compatibility: Does the format behave well in the actual app and device? A file that works on one reader may behave differently on another.
Do not assume “PDF equals inaccessible” or “EPUB equals accessible”. Some PDFs are properly tagged and navigable; some EPUBs are poorly authored or badly supported by a particular reading app. Even reflowable text can lack headings, alternative descriptions or correct language metadata. Test the specific file.
Why ‘screen reader’, ‘contrast’ and ‘alternative text’ matter
A screen reader is software that presents digital content through speech or other output. Contrast refers to the visual difference between text and its background. Alternative text is a written description that conveys the purpose or meaning of an image where suitable.
These are not fancy labels to memorise. They are questions a student, teacher or parent can ask: Can the content be heard? Can it be seen comfortably? Is the information in a chart available without relying only on colour? If two diagrams differ, does the accompanying explanation make the difference clear?
The W3C’s Web Content Accessibility Guidelines include a reflow criterion for most text-like web content when the view is narrowed, with exceptions where two-dimensional layout is necessary for meaning, such as maps and some diagrams. W3C’s EPUB specification describes reflowable reading and fixed-layout options. Those standards help explain the design vocabulary; they do not prove that any particular school file meets all accessibility criteria.
An accessible-reading experiment for students
Choose a short, authorised class passage—not a copyrighted file you do not have permission to copy. First read it at normal size and underline two words you want to remember. Next increase font size substantially. Does each line rewrap? Can you find the same paragraph by searching for a phrase? Then read one page containing a diagram and check whether labels and caption still make sense.
Record findings under three headings: usable, needs adjustment and ask for an alternative. Students can compare results without ranking each other’s visual needs. The aim is to identify which settings and formats help each reader complete the task.
A five-minute vocabulary transfer routine
- Ask the learner to explain reflowable in their own words without mentioning a particular brand or app.
- Show ordinary prose in wide and narrow windows; ask what changed and what stayed the same.
- Introduce a diagram that benefits from a fixed layout; ask why reflowing everything could lose meaning.
- Ask for one precise request to a teacher: “May I have a searchable, resizable text version of this chapter?”
- Revisit the terms two days later with a different document and check whether the learner can still choose the appropriate format.
Common misconceptions and careful corrections
“Bigger text is always enough.” Not if zoom causes horizontal scrolling through every sentence. The student should test wrapping, spacing and navigation.
“Fixed layout is always bad.” No. The relationship between labels and graphics can be essential. Consider whether ordinary prose can also be supplied in an adaptable form.
“If I can see it, anyone can use it.” Different learners access words and images in different ways. A good check involves more than the experience of one person.
“A page number is a universal location.” In reflowable books, changing font or device can change displayed page boundaries. Use stable chapters, headings and quotations where appropriate; see the existing guide to eBook page-number changes.
Frequently asked questions
Should a parent buy only reflowable eBooks? No. Match the resource to the learner’s task, the quality of its accessible features and the actual device. Reading-heavy prose and diagram-heavy worksheets may need different formats.
Do accessibility settings reduce the difficulty of the content? They change how information is presented, not necessarily the underlying vocabulary or concepts. Learning still requires explanation, retrieval and practice.
Can this help a child preparing for PSLE or Secondary examinations? It can make assigned reading easier to access and revisit. It does not replace syllabus learning or guarantee any exam outcome; official assessments have their own permitted formats and arrangements.
A wider reading route
For an established map of vocabulary development, use the eduKateSG Vocabulary hub. The separate captions, subtitles and transcripts guide addresses accessible video, not digital book layout. In both cases, useful vocabulary helps families specify the resource they actually need.
Sources checked: W3C WAI: understanding reflow; W3C EPUB 3.4 specification; MOE Primary English Language Syllabus 2020. The sample books and students are hypothetical teaching examples.