getElementById() -Returns the element with the specified id attribute value
<div id="foo">
getElementById("foo");
getElementsByName() -Returns all elements whose name
attribute has the specified value
<input type="text" name="foo">
getElementsByName("foo");
getElementsByTagName() Return all elements whose tag name
matches the specified value
<input type="text">
getElementsByTagName("input");
With the new Selectors API, there are now more precise ways to specify which elements you would
like to retrieve without resorting to looping and iterating through a document using standard DOM. The
Selectors API exposes the same selector rules present in CSS as a means to find one or more elements in
the page. For example, CSS already has handy rules for selecting elements based on their nesting,
sibling, and child patterns.
<div id="foo">
getElementById("foo");
getElementsByName() -Returns all elements whose name
attribute has the specified value
<input type="text" name="foo">
getElementsByName("foo");
getElementsByTagName() Return all elements whose tag name
matches the specified value
<input type="text">
getElementsByTagName("input");
With the new Selectors API, there are now more precise ways to specify which elements you would
like to retrieve without resorting to looping and iterating through a document using standard DOM. The
Selectors API exposes the same selector rules present in CSS as a means to find one or more elements in
the page. For example, CSS already has handy rules for selecting elements based on their nesting,
sibling, and child patterns.