diff --git a/guidelines/index.html b/guidelines/index.html index fd9dff1ae5..622c57556a 100644 --- a/guidelines/index.html +++ b/guidelines/index.html @@ -288,6 +288,8 @@
AA
+New
+ +For each target, there is an area with a width and height of at least 44 CSS pixels that includes it, and no other targets, except when:
+This criterion has been formulated to increase the hit-area of small targets, but the group would like feedback from providers of touch-screen devices if there is another way of forming the criteria to better complement the tap-heuristics used.
+Are there issues with internationalization when describing inline links?
+Are there issues with pop-over content overlapping targets triggering failures?
+ +CSS
+ +All technologies that support CSS and pointer input.
+The objective of this technique is to ensure that links in navigation or pagination menus will be spaced so that they fall within an area that measures at least 44 x 44 CSS pixels if the target area itself is smaller than that. The aim is to provide an adequate target clearance so the offset to adjacent targets is sufficient to prevent accidental pointer activation of adjacent targets.
+ +The following examples can be seen as rendered versions in the working examples.
+ +The first example shows a situation where the targets (in this case, the linked numbers in th pagination menu) are smaller than 44 x 44 CSS pixels. However, the list items that contain them have a minimum height and width of 44 px set, so that sufficient target spacing is assured.
+ +Given the following HTML:
+<nav class="pag" aria-label="pagination menu">
+ <ol class="pagination-1">
+ <li><span>previous</span></li>
+ <li><strong>1</strong></li>
+ <li><a href="#">2</a></li>
+ <li><a href="#">3</a></li>
+ <li><a href="#">4</a></li>
+ <li><a href="#">5</a></li>
+ <li><a href="#">next</a></li>
+ </ol>
+</nav>
+ The following CSS would ensure the minimum spacing is applied:
+ol.pagination-1 li {
+ display: inline-block;
+ min-width: 44px;
+ min-height: 44px;
+}
+
+ The second example uses min-width and min-height on the targets (the linked numbers in the pagination menu) and not on the parent container, thereby meeting this target spacing Success Criterion and incidentally also the AAA Success Criterion 2.5.5 Target Size.
+ +Given the following HTML:
+<nav class="pag" aria-label="pagination menu">
+ <ol class="pagination-2">
+ <li><span>previous</span></li>
+ <li><strong>1</strong></li>
+ <li><a href="#">2</a></li>
+ <li><a href="#">3</a></li>
+ <li><a href="#">4</a></li>
+ <li><a href="#">5</a></li>
+ <li><a href="#">next</a></li>
+ </ol>
+ </nav>
+ The following CSS ensures the minimum size is applied:
+ol.pagination-2 a,
+ol.pagination-2 strong,
+ol.pagination-2 span {
+ display: block;
+ line-height:44px;
+ min-height:44px;
+ min-width: 44px;
+}
+ For each target that cannot be enlarged by a mechanism, is not inline, and is not covered by the essential exception:
+This understanding document is part of the draft WCAG 2.2 content. It may change or be removed before the final WCAG 2.2 is published.
+++Pointer Target Spacing
+ +AA
+New
+ +For each target, there is an area with a width and height of at least 44 CSS pixels that includes it, and no other targets, except when:
++
+- Enlarge: A mechanism is available to change the CSS pixel size of each target, or its spacing, so there is an area with a width and height of at least 44 CSS pixels that includes it, and no other targets;
+- Inline: The target is in a sentence or block of text;
+- User agent: The size of the target is controlled by the user agent and is not modified by the author;
+- Essential: A particular presentation of the target is essential to the information being conveyed.
+This criterion has been formulated to increase the hit-area of small targets, but the group would like feedback from providers of touch-screen devices if there is another way of forming the criterion to better complement the tap-heuristics used.
+Are there issues with internationalization when describing inline links?
+Are there issues with pop-over content overlapping targets triggering failures?
+
The intent of this Success Criterion is to ensure targets can easily be activated without accidentally activating an adjacent target. When targets are small, it is difficult for users with hand tremors and those who have difficulty with fine motor movement to activate them accurately. Providing spacing between targets will reduce the likelihood of accidentally activating the wrong control.
+ +The requirement is for targets that are smaller than 44 x 44px to be included in an area with a width and height of at least 44px each. For the horizontal dimension, this means that the total width of 44px is composed of the width of the target and the width of the spacing that separates it from adjacent targets. The same applies to the height. For example, a target of 24 x 24px would meet the requirement if it had a spacing of 10 px on all sides. If the target is 44 x 44px or larger, no spacing between it and adjacent targets would be required.
+ + +There are three exceptions:
+The requirement is independent of the zoom factor of the page, when users zoom in the CSS pixel size of elements does not change. This means that authors cannot meet it by claiming that the target will have enough spacing or sufficient size if the user zooms into the page.
+ +The requirement does not apply to the spacing of targets inside unstyled native elements. For example, when a default select element is used, the vertical spacing of option elements inside the select's dropdown list is exempt.
+ +While the Success Criterion primarily helps touch users by ensuring that activation with the 'fat finger' will not accidentally trigger adjacent targets, it is also useful for mouse or pen users. It reduces the chances of erroneous activation due to a tremor or some other input imprecision.
+ +As mobile devices generally have internal heuristics to identify which link is closest, spacing can work as effectively as a larger target size.
+ + + + + + + + + +Where targets are embedded inside other targets, the inner target either needs a size of at least 44 x 44 CSS pixels or must be placed at the edge or corner to make sure that there is sufficient adjacent spacing in each dimension.
+ + + +Users with different disabilities have different needs for control sizes. It can be beneficial to provide an option to increase the active target area without increasing the visible target size. Another option is to provide a mechanism to control the density of layout and thereby change target size or spacing, or both. This can be beneficial for a wide range of users. For example, users with visual field loss may prefer a more condensed layout with smaller sized controls while users with other forms of low vision may prefer large controls.
+ +Where user-agents control the size of a target, such as the options in a select
drop-down, and the author has not tried to change the size of target with size or padding adjustments, the target is exempted from this criterion. It would be beneficial for users if the minimum size & spacing requirement is meet, but where the user-agent has defined the target it is not the authors responsibility.
Having targets with sufficient target spacing can help all users who may have difficulty in confidently targeting or operating small controls. Users who benefit include, but are not limited to:
+This example relates to technique C42.
+ +The first example shows a situation where the targets (in this case, the linked numbers in th pagination menu) are smaller than 44 x 44 CSS pixels. However, the list items that contain them have a minimum height and width of 44 px set, so that sufficient target spacing is assured.
+HarperCollins, 1800. Condition: Good.
+Real People Press, 1804. Shows some signs of wear, and may have some markings on the inside.
+1838. Condition: Very Good. Published by Belmont Books, 1969.
+The second example uses min-width and min-height on the targets (the linked numbers in the pagination menu) and not on the parent container, thereby meeting this target spacing Success Criterion and the AAA Success Criterion 2.5.5 Target Size.
+HarperCollins, 1800. Condition: Good.
+Real People Press, 1804. Shows some signs of wear, and may have some markings on the inside.
+1838. Condition: Very Good. Published by Belmont Books, 1969.
+