What is the meaning of <%%= in Ruby on Rails? -


i cannot find anywhere in project working with. doesn't work in same way <%= (i tried change), can't understand difference. 

<span class="option-content" placeholder="<%=t('pages.edit.option')%>">   <%%= content %> </span>

in short, erb processes double-percent marks single-percent marks.

it looks you're using 1 layer of erb templates generate layer of erb templates.

the first layer of erb doesn't need variable called content, t method: 

<span class="option-content" placeholder="<%=t('pages.edit.option')%>">   <%%= content %> </span>

that first layer rendered produce second layer: 

<span class="option-content" placeholder="edit">   <%= content %> </span>

as can see, erb template. expect else, later on, takes second erb , uses render like: 

<span class="option-content" placeholder="edit">   hello, world. </span>

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