shim

问题 So I'm using background-size:cover to achieve the desired effect of a background image that scales to any size of the div it's applied to while maintaining the aspect ratio. Why use this method? The image is being applied as the background using inline CSS, dynamically through PHP, based on what's being set as the image in the correlating WordPress post. So everything works great, but is there any fallback to ensure this'll work in at least IE8? Possibly some Javascript fixes? Already tried

问题 Is there any JavaScript Array library that normalizes the Array return values and mutations? I think the JavaScript Array API is very inconsistent. Some methods mutate the array: var A = [0,1,2]; A.splice(0,1); // reduces A and returns a new array containing the deleted elements Some don’t: A.slice(0,1); // leaves A untouched and returns a new array Some return a reference to the mutated array: A = A.reverse().reverse(); // reverses and then reverses back Some just return undefined: B = A

问题 What is the meaning of polyfills in HTML5? I saw this word in many sites about HTML5, e.g. HTML5-Cross-Browser-Polyfills. So here we\'re collecting all the shims, fallbacks, and polyfills in order to implant HTML5 functionality in browsers that don\'t natively support them. I actually don\'t understood what is the meaning of polyfills. Is it a new HTML5 technique or a JavaScript library? I never heard this word before HTML5. And what is the difference between shims, fallbacks, and polyfills?

问题 Uhm I\'m not sure if anyone has encountered this problem a brief description is on IE6 any <select> objects get displayed over any other item, even div\'s... meaning if you have a fancy javascript effect that displays a div that\'s supposed to be on top of everything (e.g: lightbox, multibox etc..) onclick of a certain element and that div overlaps a <select> your div get\'s to be displayed as if it\'s under the <select> [on this case a max and minimum z-index doesn\'t work ] I\'ve tried