Known accessibility issues

[geealbers]

1. Heading Nesting

In catalogue entries 1, 2, 7, 8, 9, and 10, there are instances where we didn't follow the proper nesting order for headings in order to get the styles to align across all entries. We should instead keep proper semantic nesting, and use CSS to override the styles. For example, this:

## Component Details

#### Lid (82.DG.17.a)

H: 14.7 × Diam: 13.1 cm, 706.1 g (5 13/16 × 5 3/16 in., 22 ozt., 14.032 dwt.)

##### Inscriptions

Rim inscribed “No. 2.”

Should instead be something like:

## Component Details

### Lid (82.DG.17.a) {.heading-styled-as-h4}

H: 14.7 × Diam: 13.1 cm, 706.1 g (5 13/16 × 5 3/16 in., 22 ozt., 14.032 dwt.)

#### Inscriptions {.heading-styled-as-h5}

Rim inscribed “No. 2.”

The specific instances where this is an issue can be identified by running the PDF though Acrobat's accessibility check, or the EPUB though Ace checker by DAISY.

2. Table headings

There are a number of tables in Note to the Reader II that show unit conversions but that don't have proper table headings. I believe to make them accessible without adding a full, top row of headings, we can make row headings instead. This would require converting the Markdown-formatted tables from this:

|        |            |                |
|--------|------------|----------------|
|1 livre | = 2 marcs  | = 489.506 grams|
|1 marc  | = 8 onces  | = 244.753 grams|
|1 once  | = 8 gros   | = 30.594 grams |
|1 gros  | = 3 deniers| = 3.824 grams  |
|1 denier| = 24 grains| = 1.275 grams  |
|1 grain |            | = 0.053 grams  |

To HTML-formatted tables like this, where the first cell of each row is a <th> element:

<table>
  <tr>
    <th>1 livre</th> <td>= 2 marcs</td> <td>= 489.506 grams</td>
  </tr>
  <tr>
    <th>1 marc</th> <td>= 8 onces</td> <td>= 244.753 grams</td>
  </tr>
  <tr>
    <th>1 once</th> <td>= 8 gros</td> <td>= 30.594 grams</td>
  </tr>
  <tr>
    <th>1 gros</th> <td>= 3 deniers</td> <td>= 3.824 grams</td>
  </tr>
  <tr>
    <th>1 denier</th> <td>= 24 grains</td> <td>= 1.275 grams</td>
  </tr>
  <tr>
    <th>1 grain</th> <td></td> <td>= 0.053 grams</td>
  </tr>
</table>

3. PDF and EPUB output

Finally, there are a handful of standard issues that will need to be addressed in the PDF and EPUB outputs. These are currently common issues in the Quire templates. They are not specific to French Silver.

• Add alt text to CC icons on copyright page
• Check PDF reading order
• Add tags and alt text for cover image in PDF
• Add required accessibility metadata to EPUB