Adjustments on Markers: user can't post new marker if too close to another one + clicking the create button will create a "placeholder" marker to show where the marker will be posted

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// WebKit-style focus

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.tab-focus() {

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  // Default

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  outline: thin dotted;

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  // WebKit

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  outline: 5px auto -webkit-focus-ring-color;

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  outline-offset: -2px;

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}