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Bootstrap/site/_includes/example.html
Patrick H. Lauke c031584bcd
SVG accessibility fixes (#27826)
* SVG accessibility fixes

- add `focusable="false"` to all SVGs, to stop IE from including the `<svg>` in its default focus cycle
- completely hide decorative SVGs using `aria-hidden="true"`
- add `role="img"` to meaningful/"content" SVGs, ensure they have an appropriate `<title>` and/or `aria-label`
- simplify placeholder default title

* Simplify usage of placeholder.svg in the docs

- in most cases, no need for separate/redundant text and title (now that we make text itself part of the alternative text explicitly)
- no need (expect in rare cirumstances) to describe the placeholder image (unless the look of the image is important/the actual content, as is the case with the image thumbnail class)

* Simplify example.html rewriting of <svg> to <img> code sample

- as the `alt` for the placeholder isn't really important, just add an ellipsis instead (otherwise, to be correct, we'd have to construct the whole "title+text" construct like we do now in the
placeholder.svg itself

* Change svgo configuration to retain role attribute and add/force focusable=false

- regarding `focusable=false`, see https://github.com/svg/svgo/issues/1011 (which would be the "proper" SVGO fix) and the (hacky) solution https://github.com/svg/svgo/pull/817
2018-12-13 13:09:47 +00:00

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{%- comment -%}
Usage: include example.html content=markup [args],
where content is a capture with the HTML content
args can be one of the following:
id - null (default)
class - "bd-example" (default)
optional: hide_preview - disabled (default)
optional: hide_markup - disabled (default)
{%- endcomment -%}
{%- assign id = include.id -%}
{%- assign class = include.class -%}
{%- if include.hide_preview == null -%}
<div{% if id %} id="{{ id }}"{% endif %} class="bd-example{% if class %} {{ class }}{% endif %}">
{{- include.content -}}
</div>
{%- endif -%}
{%- if include.hide_markup == null -%}
{%- highlight html -%}
{%- if include.content contains '<svg class="bd-placeholder-img' -%}
{%- assign modified_content = include.content
| replace: '<svg class="bd-placeholder-img', '<svg class="bd-placeholder-img'
| replace: '</svg>', '</svg>✂️'
| split: '✂️' -%}
{%- if include.content contains 'bd-placeholder-img ' -%}
{%- assign image_class = include.content
| replace_first: 'bd-placeholder-img', 'bd-placeholder-img ✂️'
| replace: '" width="', '✂️" width="'
| split: '✂️' -%}
{%- assign image_class = image_class[1] | replace: 'bd-placeholder-img-lg', '' | strip -%}
{%- endif -%}
{%- for content_chunk in modified_content -%}
{%- if content_chunk contains '<svg class="bd-placeholder-img' -%}
{%- capture img_placeholder -%}
<img src="..." {% if image_class %}class="{{ image_class }}" {% endif %}alt="...">
{%- endcapture -%}
{{- img_placeholder -}}
{%- else -%}
{{- content_chunk -}}
{%- endif -%}
{%- endfor -%}
{%- else -%}
{{- include.content -}}
{%- endif -%}
{%- endhighlight -%}
{%- endif -%}