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Chemical - An Interactive Periodic Table of

Date of publication: 2017-08-26 08:48

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The no-validate state of an element is true if the element is a submit button and the element's formnovalidate attribute is present, or if the element's form owner 's novalidate attribute is present, and false otherwise.

BJ Fogg's Behavior Model

Constraint validation : While the user interface describes input that the user agent cannot convert to a valid floating-point number , the control is suffering from bad input.


When showing option elements in select elements, user agents should show the option elements of such groups as being related to each other and separate from other option elements.

The following common input element content attributes, IDL attributes, and methods apply to the element: autocomplete , maxlength , minlength , pattern , placeholder , readonly , required , and size content attributes selectionStart , selectionEnd , selectionDirection , and value IDL attributes select() , setRangeText() , and setSelectionRange() methods.

The following IDL attributes and methods do not apply to the element: checked , files , list , selectionStart , selectionEnd , selectionDirection , valueAsDate , and valueAsNumber IDL attributes select() , setRangeText() , setSelectionRange() , stepDown() , and stepUp() methods.

The willValidate , validity , and validationMessage IDL attributes, and the checkValidity() , and setCustomValidity() methods, are part of the constraint validation API. The labels IDL attribute provides a list of the element's label s. The select() , selectionStart , selectionEnd , selectionDirection , setRangeText() , and setSelectionRange() methods and IDL attributes expose the element's text selection. The autofocus , disabled , form , and name IDL attributes are part of the element's forms API.

The following common input element content attributes, IDL attributes, and methods apply to the element: autocomplete , list , max , min , placeholder , readonly , required , and step content attributes list , value , and valueAsNumber IDL attributes stepDown() and stepUp() methods.

There are two attributes that determine the current task completion represented by the element. The value attribute specifies how much of the task has been completed, and the max attribute specifies how much work the task requires in total. The units are arbitrary and not specified.

Mendeleev realized that the table in front of him lay at the very heart of chemistry. And more than that, Mendeleev saw that his table was incomplete - there were spaces where elements should be, but no-one had discovered them.

A form control is disabled if its disabled attribute is set, or if it is a descendant of a fieldset element whose disabled attribute is set and is not a descendant of that fieldset element's first legend element child, if any.

If an element has its form control minlength attribute specified, the attribute's value must be a valid non-negative integer. If the attribute is specified and applying the rules for parsing non-negative integers to its value results in a number, then that number is the element's minimum allowed value length. If the attribute is omitted or parsing its value results in an error, then there is no minimum allowed value length.

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