[donpdonp]

One of the easiest ways is to start with an image that is already in existence, using it as an image source, and then animating it. Remember, you can use GIFs, JPGs, PNGs, SVGs and other file types here as an image source, as long as they are allowed file types—and sizes—in your environment. SVGs are often not allowed, due to security concerns. The MDN document, Basic animations, provides outstanding examples of this, using multiple image sources for the sun, earth, and moon, and using several canvas methods to control the speed and animation of the earth as it orbits around the sun, and the moon as it orbits around the earth. Use the codepen available with this tutorial to adjust ctx.rotate in the code to see how the animation is affected when changes are made. here

[BitterTea]

All animations are potentially dangerous. As designers and developers our responsibility is to ensure we do no harm either intentionally or unintentionally. If we must include something that has the potential to cause harm, it is vital to prevent users from accidentally encountering the harmful content, and to provide ways for users to prevent and control animations mitigating potential harm: more

[foxhunter]

Common ways to include the alternative stylesheets into your HTML documents are to use the <link> element, and @import . [links]

[w8ks6]

In August, 2004, the Epilepsy Foundation of America convened a workshop to begin to develop an expert consensus on photosensitive seizures. The following, expert, and authoritative information is from: Photic- and pattern-induced seizures: expert consensus of the Epilepsy Foundation of America Working Group.

[Alex]

The point that the field of vision is an important consideration arises in the article addressing WCAG 2.3.1 continues: "The 1024 x 768 screen is used as the reference screen resolution for the evaluation. The 341 x 256 pixel block represents a 10 degree viewport at a typical viewing distance. (The 10 degree field is taken from the original specifications and represents the central vision portion of the eye, where people are most susceptible to photo stimuli.)"

[kbelanger]

Lumosity takes scientifically-validated tasks and turns them into fun games, actionable feedback, and rich insights into your cognition. more

[bagazaga]

Memory. Attention. Flexibility. Processing Speed. Problem Solving. Lumosity targets the skills that matter to you most. [links]

[macktyalor]

Work out with a fresh set of games each day to keep you challenged. Detailed progress tracking helps maintain your brain training habit.

[BitLex]

No matter your age or skill level, Lumosity knows that all brains are different, and our program adapts to your unique strengths and weaknesses. more

[cronicleu1]

Don’t reinvent the wheel, stick to form design conventions. People are used to these conventions and don’t want to have to think about how to use a control they’re not familiar with. Complex constructions often have a higher learning curve to understand.

[afed]

Use role=”alert” on an element that is newly created in the DOM: here

[jon_smark]

Every form control needs a visible label and that label needs to be attached to the corresponding form control by a for/id construction.

[tsxparts01]

Toggles, dropdowns, and tooltips are extra hurdles people need to jump through to get information, these add to the cognitive load. There is a risk people won’t get the pattern of hiding you had in mind. If information is essential to fill out a form, best not to hide it by default. You want people to fill out your form as easy as possible. here

[ChesterA321]

Make sure HTML IDs are always unique to the page. This is important for assistive technology, so they can target a specific element by its (related) id.

[hugolp]

A form control must work, that’s its main purpose. Making it nice is an extra. [links]

[NuAngel]

While dark adaption may take 30 minutes, light adaptation is much faster, taking only a few minutes. An example is leaving a dark theater on a Saturday afternoon, and being dazed by the bright sunlight for a minute or two. This adaptation period can even be painful for some people. here

[DerrickEaton]

For accessibility guidelines the sRGB colorspace is most commonly used. This is not only because sRGB is the current default standard for the the web, but also the sRGB color primaries are well suited for accessibility concerns. For instance, the "red" sRGB primary is actually a red-orange, with a dominant wavelength of 611nm which overlaps into the M cone (green) sensitivity. more

[jackkalis58]

The normal human eye has three types of cones that are sensitive to red, green, and blue light. But our spectral sensitivity is not uniform, as we are most sensitive to green (555 nm), and blue is a distant last place. Luminance is spectrally weighted to reflect this using the following coefficients for sRGB:

[jimbobway]

Also known as scotopic or "night vision." Here the eye is adapted to a very dark level. Instead of the "color" sensitive cones, another type of cell called rods becomes active. Rods are sensitive to very low light levels and don't sense color. Despite being very sensitive to light, with night vision the resolution is very poor, and details can be hard to see. here

[OBTC]

In some of the previous examples, you'll notice that some have a fourth value which is called “alpha”, the A in RGBA. The alpha channel is not a color channel, but defines transparency in terms of the opacity value of the color. A higher value means the color is more opaque therefore less transparent. In the examples above, the alpha value is set to half or 50% opaque. more