fix(curriculum): check only margin-left is set (freeCodeCamp#55584)

Author: lasjorg

curriculum/challenges/english/14-responsive-web-design-22/learn-typography-by-building-a-nutrition-label/615f70077a4ff98424236c1e.md

@@ -14,13 +14,20 @@ Create a new `.indent` selector and give it a `margin-left` property set to `1em
 You should have a new `.indent` selector.
 
 ```js
-assert(new __helpers.CSSHelp(document).getStyle('.indent'));
+assert.isNotNull(new __helpers.CSSHelp(document).getStyle('.indent'));
 ```
 
-Your new `.indent` selector should have a `margin-left` property set to `1em`.
+Your `.indent` selector should have a `margin-left` property set to `1em`.
 
 ```js
-assert(new __helpers.CSSHelp(document).getStyle('.indent')?.marginLeft === '1em');
+assert.strictEqual(new __helpers.CSSHelp(document).getStyle('.indent')?.marginLeft, '1em');
+```
+
+Your `.indent` selector should only set the `margin-left` property, not other margin properties.
+
+```js
+const { marginTop, marginRight, marginBottom } = new __helpers.CSSHelp(document).getStyle('.indent') ?? {};
+assert.isTrue([marginTop, marginRight, marginBottom].every(prop => prop === ''));
 ```
 
 # --seed--

curriculum/challenges/english/14-responsive-web-design-22/learn-typography-by-building-a-nutrition-label/615f83ef928ec9982b785b6a.md

@@ -14,13 +14,20 @@ Create a `.double-indent` selector and give it a left margin of `2em`.
 You should have a new `.double-indent` selector.
 
 ```js
-assert(new __helpers.CSSHelp(document).getStyle('.double-indent'));
+assert.isNotNull(new __helpers.CSSHelp(document).getStyle('.double-indent'));
 ```
 
 Your `.double-indent` selector should have a `margin-left` property set to `2em`.
 
 ```js
-assert(new __helpers.CSSHelp(document).getStyle('.double-indent')?.marginLeft === '2em');
+assert.strictEqual(new __helpers.CSSHelp(document).getStyle('.double-indent')?.marginLeft, '2em');
+```
+
+Your `.double-indent` selector should only set the `margin-left` property, not other margin properties.
+
+```js
+const { marginTop, marginRight, marginBottom } = new __helpers.CSSHelp(document).getStyle('.double-indent') ?? {};
+assert.isTrue([marginTop, marginRight, marginBottom].every(prop => prop === ''));
 ```
 
 # --seed--