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By Brandon Satrom
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Info | 15 Speaking of success, let’s build on our vision statement and talk about some principles for building responsible polyfills. Principles of Responsible Polyfill Development I’m a big fan of guiding principles and patterns, and not so much a fan of lists of rules. In my experience, it’s too easy to allow lists of rules to turn into checklists and, when that happens, one can lose all sense of context around the current problem—meaning, rules tend to be rote, often applied without context.
Finally, I’ll check the type attribute. If its value is still text even after I set it to another value, such as color, that means that the browser does not support this input type. As such, I’ll return false. If the value is retained, browser support is available, and I’ll return true. To leverage this home grown feature-detection method, I’ll modify the code in Example 3-6 to first check for support, as shown in Example 3-8. Now if I refresh Chrome or Opera, the built-in browser support is back, while custom widget support provided by my polyfill will be leveraged for all other browsers.
The value IDL attribute is in mode value. • The input and change events apply. • The following content attributes must not be specified and do not apply to the element: accept, alt, checked, dirname, formaction, formenctype, formmethod, for‐ mnovalidate, formtarget, height, maxlength, max, min, multiple, pattern, place‐ holder, readonly, required, size, src, step, and width. • The following IDL attributes and methods do not apply to the element: checked, files, selectionStart, selectionEnd, selectionDirection, valueAsDate, and valueAs‐ Number IDL attributes; select(), setSelectionRange(), stepDown(), and stepUp() methods.