How can I add a custom attribute to a  and read it in JavaScript?
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Custom attributes - Yea or nay?
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Lightning: why can you not have an expression combined with text in an HTML attribute?
100521
Adding attribute in jQuery
83816
How do I create a dynamic key to be added to a JavaScript object variable
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How to "properly" create a custom object in JavaScript?
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Get list of data-* attributes using javascript / jQuery
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jQuery attribute selector variable
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How do I add custom properties to a form
108831
html "data-" attribute as javascript parameter
16638
Add a property to a JavaScript object using a variable as the name?
27918
XmlSerialize a custom collection with an Attribute
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How to retrieve the display property of a DOM element?
94537
Can I add custom methods/attributes to built-in Python types?
22221
How do I escape quotes in HTML attribute values?
24663
How can I add an ampersand for a value in a ASP.net/C# app config file value
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How do you change the value of a lightning-input-field in javascript?
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How do you create a method for a custom object in JavaScript?